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  • 2 answers

Kaneria Deepa Patel 5 years, 5 months ago

रचयत

Shailly Gupta 5 years, 5 months ago

रच्यता
  • 2 answers

Vansh Saini 5 years, 5 months ago

99999

Yogita Ingle 5 years, 6 months ago

Greatest 6 digit number = 999999
previous numbers in descending order = 999998, 999997, 999996, 999995, 999994

  • 1 answers

Yogita Ingle 5 years, 6 months ago

The following things may have a counting of more than six digits number.
1. Number of people in the world.
2. Number of cars in the world
3. Number of stars in the sky.
4. Number of grains of sand in the Sahara desert
5. Number of books in the world
6. Number of currency notes in the world. 

  • 2 answers

Tiyasha Mandal 5 years, 5 months ago

The people who wrote the Vedas called themselves as Arya's and the opponents as Dasas or Dasyus

Gaurav Seth 5 years, 6 months ago

Aryans Dasas
a. Aryans were the racial group, the original speakers of Indo European languages. They have been referred as non Aryans, wealthy cattle raising group of the non Indo European population.
b. It is believed that their religious customs, norms shaped the vedic religion and tradition. These people rejected the religious customs and practises of Aryans,

 

  • 5 answers

Nitiksha Vasava 5 years, 5 months ago

I wanted help

Priyesh Rai 5 years, 5 months ago

I think egg

Sadhana Ramesh 5 years, 6 months ago

Eggs I think so

Ranjan Kumar Parida 5 years, 6 months ago

Hen

N.A.Sahana N.A.Sahana 5 years, 6 months ago

Hen came frist
  • 1 answers

Priyani Das 5 years, 5 months ago

?
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  • 1 answers

Akshara Chelawat 5 years, 6 months ago

Peace is a concept of societal friendship and harmony in the absence of hostility and violence. In a social sense, peace is commonly used to mean a lack of conflict (such as war) and freedom from fear of violence between individuals or groups. Throughout history leaders have used peacemaking and diplomacy to establish a certain type of behavioral restraint that has resulted in the establishment of regional peace or economic growth through various forms of agreements or peace treaties. Such behavioral restraint has often resulted in the reduction of conflicts, greater economic interactivity, and consequently substantial prosperity. "Psychological peace" (such as a peaceful thinking and emotions) is perhaps less well defined yet often a necessary precursor to establishing "behavioral peace." Peaceful behavior sometimes results from a "peaceful inner disposition." Some have expressed the belief that peace can be initiated with a certain quality of inner tranquility that does not depend upon the uncertainties of daily life for its existence.[1] The acquisition of such a "peaceful internal disposition" for oneself and others can contribute to resolving of otherwise seemingly irreconcilable competing interests
  • 2 answers

N.A.Sahana N.A.Sahana 5 years, 6 months ago

Frebics

Akshara Chelawat 5 years, 6 months ago

What is Plant Fiber? A material which is composed of thin and continuous strands is known as fibre. Plant fibres are elongated most commonly sclerenchyma supportive plant cells with thick cellulose walls with a well-organised structure. Fibre can be of two types. Natural fibre  Synthetic fibre The fibres which are obtained from plants and animals are known as natural fibres whereas synthetic fibres are man-made fibres; most of them are prepared from raw materials (petroleum) called as petrochemicals.
  • 3 answers

Soumika Patnaik 5 years, 5 months ago

DIWALI AND HOLI etc are the festivals celebrated by hindus muslims and sikhs

Divya Parashar 5 years, 5 months ago

Hindu - Diwali Holi Muslim - I'd Bakrid Sikh - Gurugadi divas Jyotojot divas

Gaurav Seth 5 years, 6 months ago

Different festivals which are celebrated in my locality are; Holi, Diwali, Eid, Christmas, Rath Yatra, Chhath, Guru Parb, etc. Holi and Diwali are Hindu festivals which are celebrated all over India. In my locality, my Muslim and Christian friends also participate in these festivals. Similarly, Hindus and Sikhs also participate in Christmas and Eid. I have seen most of my Hindu friends wearing the Santa Clause cap during Christmas. Rath Yatra is mainly celebrated in Orissa. But in my locality, when people from Orissa take out the procession; everyone from the neighbourhood participate in that. Chhath is mainly celebrated in Bihar and Eastern UP. But in my locality, most of the people throng the venue of Chhath Puja.

  • 1 answers

Gaurav Seth 5 years, 6 months ago

Cultivation of cotton

Cotton is cultivated in black clayey soil. It needs warm climate. The sowing of cotton crop is done in early spring. Cotton plants are bushy and about 1-2 meters tall. The plants start flowering in about 60 days and give whitish - yellow flowers. The flowers turn reddish in a few days. Flowers slowly grow into spherical walnut-like structures. These are called cotton ball. Fibres of cotton grow on these seeds. After some time green cotton balls turn brown. At maturity, the cotton bolls burst open and the white cotton fibre can be seen.

Ginning: The cotton picked up from the plants has seeds in it. The process of removing cotton seeds from pods is called ginning. Ginning was traditionally done by hand. Now-a-days, machines are used in ginning.

Spinning: The process of making yarn from fibre is called spinning. The raw cotton is supplied to industry in the form of bales.

Weaving: The process of arranging two sets of yarn together to make a fabric is called weaving. The big reels of yarn are called bobbins. These bobbins are used for weaving the cloth. Cloth is woven on looms. After that they bleached and dyed to give a finish.

Knitting: Knitting can be done by hand and machine. Just two yarns are used in knitting, while more than two yarns are used in weaving. Sweater, socks, scarf and caps are knitted from the wool.

  • 5 answers

Akshara Chelawat 5 years, 6 months ago

Snake Teeth  The type of teeth a snake has is dependent upon how the species catches food. All non-poisonous snakes have teeth on the upper jaw and the lower jaw. A snake can often grow more teeth as needed because teeth are sometimes lost while feeding. The teeth are hook-shaped and angle toward the throat. Poisonous snakes have either grooved or hollow fangs. The poison, which comes from glands located under each eye, flows down the groove or through the hollow portion of the fangs and is injected into the prey

Sakshi Balaji Battalwad 5 years, 6 months ago

No

N.A.Sahana N.A.Sahana 5 years, 6 months ago

No

Akshara Chelawat 5 years, 6 months ago

Snake Teeth  The type of teeth a snake has is dependent upon how the species catches food. All non-poisonous snakes have teeth on the upper jaw and the lower jaw. A snake can often grow more teeth as needed because teeth are sometimes lost while feeding. The teeth are hook-shaped and angle toward the throat. Poisonous snakes have either grooved or hollow fangs. The poison, which comes from glands located under each eye, flows down the groove or through the hollow portion of the fangs and is injected into the prey

Yogita Ingle 5 years, 6 months ago

Most of the snakes have teeth, 

  • 4 answers

N.A.Sahana N.A.Sahana 5 years, 6 months ago

True

Akshara Chelawat 5 years, 6 months ago

Answer: The process of making yarn from fibres is called spinning. In this process, fibres from a mass of cotton are drawn out and twisted. ... Spinning is done at home using simple devices like hand spindle (Takli) and charkha

Yogita Ingle 5 years, 6 months ago

True
The process of making yarn from fibres is called spinning. In this process, fibres from a mass of cotton wool are drawn out and twisted. This brings the fibres together to form a yarn. A simple device used for spinning is a hand spindle also known as takli. Another hand operated device used for spinning is charkha.

Gaurav Seth 5 years, 6 months ago

The given statement is true

  • The process of making yarn from fibres is called spinning. In this process, fibres from a mass of cotton are drawn out and twisted.
  • This brings the fibres together to form a yarn.
  • Spinning is done at home using simple devices like hand spindle (Takli) and charkha. On large scale big spinning machines are used.
  • 1 answers

Gaurav Seth 5 years, 6 months ago

  • Vending, hair-cutting, shoe-repairing, flower-selling etc. 
  • Singing and dancing events on the streets, there are fairs that are organized on the streets, some services are offered on the street as well, such as shoe polishing.
  • In addition, icecream selling is another activity that takes place.
  • 0 answers
  • 3 answers

Anuska Singh 5 years, 5 months ago

I am giving the example of divisibility by 11 is –1+3+5+8=17 2+6+7+9=24 Difference =24-17=7 7 is the Difference

Sakshi Balaji Battalwad 5 years, 6 months ago

we have to add the alternating numbers and then both the answers you have to subtract after subtracting if the difference is zero or divisible by 11 then the number is divisible by

Saksham Patil 5 years, 6 months ago

Example 2734 is the number Then we have to add 2+3 and 7+4. We have to take alternative numbers and add it. 7+4=11 and 2+3=5 then we have to subtract both the number 11-5=6. Then we have to see whether it is divisible by 11 or not. 6 is not divisible by 11.
  • 5 answers

Kids Fancy Dresses Hamirpur 5 years, 5 months ago

A globe is a miniature model of earth and it is used to study our earth

N.A.Sahana N.A.Sahana 5 years, 6 months ago

A globe is the model of the earth we can see longitudes & more

Akshara Chelawat 5 years, 6 months ago

A globe is a spherical model of Earth, of some other celestial body, or of the celestial sphere. Globes serve purposes similar to some maps, but unlike maps, do not distort the surface that they portray except to scale it down. A model globe of Earth is called a terrestrial globe. A model globe of the celestial sphere is called a celestial globe. A globe shows details of its subject. A terrestrial globe shows landmasses and water bodies. It might show nations and major cities and the network of latitude and longitude lines. Some have raised relief to show mountains and other large landforms. A celestial globe shows notable stars, and may also show positions of other prominent astronomical objects. Typically, it will also divide the celestial sphere into constellations. The word globe comes from the Latin word globus, meaning "sphere". Globes have a long history. The first known mention of a globe is from Strabo, describing the Globe of Crates from about 150 BC. The oldest surviving terrestrial globe is the Erdapfel, wrought by Martin Behaim in 1492. The oldest surviving celestial globe sits atop the Farnese Atlas, carved in the 2nd century Roman Empire.

Deeksha Thakur 5 years, 6 months ago

Globe is a true model (miniature form) of the earth. A needle is fixed through the globe in a tilted manner, which is called its axis. Two points on the globe through which the needle passes are two poles – North Pole and South Pole.

Yogita Ingle 5 years, 6 months ago

Globe is a true model (miniature form) of the earth. A needle is fixed through the globe in a tilted manner, which is called its axis. Two points on the globe through which the needle passes are two poles – North Pole and South Pole.

yio
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Amana Arshad 5 years, 5 months ago

That's not a question
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  • 2 answers

Divya Parashar 5 years, 5 months ago

28 July 1914 - 11 November 1918

Anvee Sharma 5 years, 6 months ago

World War I (often abbreviated as WWI or WW1), also known as the First World War or the Great War, was a global war that lasted from 28 July 1914 to 11 November 1918. Contemporaneously described as "the war to end all wars",[7] it led to the mobilisation of more than 70 million military personnel, including 60 million Europeans, making it one of the largest wars in history.[8][9] It is also one of the deadliest conflicts in history,[10] with an estimated nine million combatant deaths and 13 million civilian deaths as a direct result of the war,[11] while resulting genocides and the related 1918 influenza pandemic caused another 17–100 million deaths worldwide.[12][13] World War I Clockwise from the top: The road to Bapaume in the aftermath of the Battle of the Somme, 1916   British Mark V tanks crossing the Hindenburg Line, 1918   HMS Irresistible sinking after hitting a mine in the Dardanelles, 1915   A British Vickers machine gun crew wears gas masks during the Battle of the Somme, 1916   German Albatros D.III biplane fighters near Douai, France, 1917 Date28 July 1914 – 11 November 1918 (4 years, 3 months and 2 weeks) Peace treaties Treaty of Versailles Signed 28 June 1919 (4 years and 11 months)[b] Treaty of Saint-Germain-en-Laye Signed 10 September 1919 (5 years, 1 month, 1 week and 6 days) Treaty of Neuilly-sur-Seine Signed 27 November 1919 (4 years, 1 month, 1 week and 6 days)[c] Treaty of Trianon Signed 4 June 1920 (5 years, 10 months and 1 week) Treaty of Sèvres Signed 10 August 1920 (6 years, 1 week and 6 days)[d] United States–Austria Peace Treaty Signed 24 August 1921 (3 years, 8 months, 2 weeks and 3 days)[e][f] United States–Germany Peace Treaty Signed 25 August 1921 (4 years, 4 months, 2 weeks and 5 days)[g] United States–Hungary Peace Treaty Signed 29 August 1921 (3 years, 8 months, 3 weeks and 1 day)[h] Treaty of Lausanne Signed 24 July 1923 (8 years, 8 months, 3 weeks and 4 days)[i] Location Europe, Africa, the Middle East, the Pacific Islands, China, Indian Ocean, North and South Atlantic Ocean Result Allied victory Central Powers victory on the Eastern Front nullified by defeat on the Western Front Fall of all continental empires in Europe (including Germany, Russia, Ottoman Turkey and Austria-Hungary) Russian Revolution and Russian Civil War, with the collapse of the Russian Empire and the subsequent formation of the Soviet Union Widespread unrest and revolutions throughout Europe and Asia Creation of the League of Nations (more ...) Territorial changes Formation of new countries in Europe and the Middle East Transfer of German colonies and territories, Partitioning the former Ottoman Empire, Austria-Hungary and the Russian Empire, transfer of territories to other countries BelligerentsAllied Powers:  France  British Empire  United Kingdom  Canada  Australia  India  New Zealand  Newfoundland  South Africa  Russia[a] (1914–17)  Serbia  Montenegro  Belgium  Japan  Italy (1915–18)  United States (1917–18)  Romania (1916–18)  Portugal (1916–18)  Hejaz (1916–18)  China (1917–18)  Greece (1917–18)  Siam (1917–18) ... and others Central Powers:  Germany  Austria-Hungary  Ottoman Empire  Bulgaria (1915–18) ... and co-belligerents
  • 2 answers

Gaurav Seth 5 years, 6 months ago

|Rasheeda is a name of girl

This chapter begins with a doubt that arises in the mind of Rasheeda, while she goes through a newspaper. This chapter will systematically help solving her query by understanding how people lived in the past, where they lived, the names of the land, the insights we get from the old manuscripts and inscriptions and the signs and symbols used by people who lived in the past.

Return to Rasheeda’s question. Can you think of some answers to it?

When Rasheeda was reading the newspaper, her eyes fell on a small headline: “One Hundred Years ago.” How, she wondered, could anyone know what had happened so many years ago?

Solution 3:

One can think of 4 different ways

  1. Inscriptions
  2. Manuscripts
  3. Tools and weapons
  4. Reading the books written in the past.

Yashashvi Kumare 5 years, 6 months ago

Its a name
  • 1 answers

Gaurav Seth 5 years, 6 months ago

One can know what had happened so many years ago through these ways:

There are various ways by which the people can know about the past. (i) The remains left by the early man in the form of tools, weapons, pottery, jewellery etc. (ii) After man had learnt the art of writing he wrote on leaves and bark of the trees and even on hard material. We have been able to read the script of these people.  

We know that historians use various sources to know about history. Some important sources are: manuscripts, coins, inscriptions, archaeological sites, etc.

  • 3 answers

Akshara Chelawat 5 years, 6 months ago

It is difficult to discuss the historical profession, or American life, for very long nowadays without encountering references to "diversity"—its history, current status, and future prospects. In schools, places of employment, and associations like the AHA, "diversity" has become a shorthand for ensuring that participation adequately reflects the heterogeneous makeup of our society, especially with regard to race and gender. The AHA has numerous rules to ensure that committees and program sessions at the annual meeting adequately reflect diversity thus defined. It is a truism, moreover, that today's scholarship takes much more cognizance than in the past of the diversity of the historical experience. There is another kind of diversity, however, that some historians feel has been sacrificed in the transformation of our profession during the past two generations—a mutual respect for the disparate subjects, methods, and interpretations that make up the discipline of history. In my first column as AHA president, I suggested that both the organization and the study of history itself were in a "healthy" condition. The first response I received, from a recently retired colleague at a prominent university, begged to differ. I am taking the liberty of quoting from his letter: "Sorry, but the state of history is very, very unhealthy. The problem is the contempt that people in cultural and social history routinely display for everyone else in other fields which would include foreign policy, mainstream political history, intellectual history, and business history. . . . Contrary to what the social and cultural types who rule the roost believe, there are no irrelevant fields in history. All fields are legitimate and provide a balance that all students need at all levels." There is no question that scholarship revolving around historical categories like gender and race and the methods and concerns of social history occupy a far more prominent place in historical scholarship than when I was in graduate school. But is it really true that "traditional" fields of study are ignored or held in contempt today? My first response on receiving this letter was to think of my own department at Columbia, where political and intellectual history once reigned supreme in the hands of such giants of the profession as Richard Hofstadter, Allan Nevins, and William Leuchtenberg. Today, fields like African American history, women's history, cultural history, and social history occupy a central place in our curriculum. Yet numerous courses still focus on politics, the nation state, and foreign relations. Even military history is not entirely neglected (although I have to admit that business and economic history seem, for the moment, to have fallen by the wayside). More important, my colleagues and I fully embrace the sentiment emphasized by the letter-writer—that so long as it is conducted at a high level of scholarship, no area of historical study is alien or irrelevant. At Columbia, political historians, intellectual historians, social historians, and cultural historians share a mutual respect and common commitment to advancing historical knowledge. Nor is it true, as is sometimes claimed, that "traditional fields" are ignored on the AHA's annual program. After receiving the above letter, I tried to categorize by field the 151 sessions at last January's annual meeting. Sessions that can be subsumed under the broad umbrella of gender, race, and "identity" were well represented (comprising 42 sessions by my count). Forty-six sessions, however, dealt with such "traditional" subjects as war, politics, nationhood, empire, public policy, and intellectual history. Another 31 focused on issues of teaching, research, historiography, and professional issues. Actually, the fields most neglected, and unfortunately so, were the history of religion, and economic and labor history, each of them represented by only a handful of sessions. Of course, these numbers are quite arbitrary, since many sessions fall into more than one category. More to the point, the rise of the "new" histories has fundamentally redefined political and intellectual history so as to include analysis based on the categories of race and gender. But I cannot believe that "traditional" historians were hard-pressed to find sessions that served their needs and interests. Nonetheless, the sense of exclusion so evident in the above letter cannot be refuted or wished away by the marshaling of statistics. Nor should it be dismissed by recalling the adage that each generation writes its own history, a process that often leaves older colleagues feeling neglected or unfairly marginalized. The continual infusion of new ideas is both inevitable and indispensable to the pursuit of historical understanding. If a significant number of historians feel unappreciated by their own colleagues or by professional associations, this is a cause for serious concern. There is not much that the president of the AHA can do to influence how historians treat one another, except to urge that all of us cultivate a spirit of collegiality, open-mindedness, and respect for all those engaged in the common project of advancing knowledge of the past. No matter how committed we are to the value of a particular field or point of view, we must recognize that historical study cannot and should not be confined to any one set of methods or approaches. It is especially incumbent on younger scholars to recognize and appreciate the contributions made by previous generations, even in the face of pressures, to highlight one's own originality by refuting earlier interpretations. More concretely, the AHA is moving to expand the number of sessions at the annual meeting so as to maximize the representation of fields and types of history. Moreover, the Program Committee for the 2000 meeting, chaired by Michael Bernstein and Barbara Hanawalt, made a concerted effort to encourage the participation of "older" scholars and more "traditional" fields. The program committee has no hidden agenda, no systematic policy of favoring some approaches to history over others. The committee, however, is largely dependent on session proposals submitted by members. In the future, if diplomatic, intellectual, and political historians desire more representation on the program, they need to mobilize themselves to submit more proposals. Such submissions will receive the same consideration as those in more au courant fields (and perhaps even a bit of affirmative action to compensate for any past neglect). I can assure all AHA members that the organization values intellectual and methodological heterogeneity as strongly as the more familiar kind of diversity. No field or approach is alien to the forever unfinished project of expanding our understanding of history.

Yogita Ingle 5 years, 6 months ago

Diversity means "variety" and "being different". It is a product of different geography, culture and history. Diversity is more than just tolerating the differences. It is respecting and understanding the varying differences among individuals in society.

Visalatchi S 5 years, 6 months ago

Explain
  • 2 answers

Akshara Chelawat 5 years, 6 months ago

SUMMARY: "HAPPY ENDINGS" “Happy Endings” is a short story by Canadian writer Margaret Atwood. After the story’s trio of opening lines, the narrative is divided into five sections, labeled A-F. The story’s opening lines are: “John and Mary meet. What happens next? If you want a happy ending, try A” (43). The story then moves into Section A, in which John and Mary “fall in love and get married…have jobs they find “stimulating and challenging…buy a house…have two children…who turn out well…retire…[and] die” (43). Atwood concludes this section with the sentence, “This is the end of the story” (43). Section B—which theoretically could be skipped to straight from the story’s opening three lines—also feature characters named John and Mary, though it is left somewhat ambiguous as to whether or not these two characters are the same John and Mary found in Section A. Mary falls in love with John, but John only uses Mary for ***. When Mary finds out from friends that John is seeing another woman, Madge, Mary commits suicide, though leaves a suicide note for John and hopes he will find her and save her life. Mary dies, and John marries Madge. Atwood concludes this section by stating “everything continues as in [Section] A” (44). In Section C, we are again introduced to two characters named John and Mary, and, much like Section B, it’s worth noting that a reader could skip from the opening lines of the story straight to Section C, and have Section C be read largely independently of Sections A and B. Here, John, who is older, falls in love with Mary, who is twenty-two. Mary meets John at work but is in love with James, “who has a motorcycle and a fabulous record collection” (44). James isn’t in love with Mary. John has two children and is married to Madge. One day, James shows up to Mary’s apartment with marijuana, after which John shows up, finds the two lovers in bed together, and kills them, before killing himself. Madge, now John’s widow, “marries an understanding man named Fred,” though only “after a suitable period of mourning” (44). Atwood concludes the section by saying that “everything continues as in A, but under different names” (44). Section D focuses on Fred and Madge, who would seem to be the same Fred and Madge mentioned in Section C. The two get along well and own a house but a “one day a giant tidal wave approaches” (44). Real estate values decrease, thousands die, but Fred and Madge survive. Again, Atwood concludes this section by saying that everything “continue[s] as in [Section] A” (45). Section E, which is only four sentences, offers that Fred has a bad heart and dies, after which Madge “devotes herself to charity work until the end of [Section] A” (45). This section concludes with: “If you like, it can be ‘Madge,’ ‘cancer,’ ‘guilty and confused,’ and ‘bird watching’ (45). Section F, the story’s last section, begins with Atwood again directly addressing the reader, and offering perhaps the story’s most metafictional content to this point. Atwood then asserts that all endings are the same and that “the only authentic ending is the one provided here: John and Mary die. John and Mary die. John and Mary die” (45). Atwood closes the story by saying plots, and plot, “are just one thing after another, a what and a what and a what. Now try How and Why.” (45). The citations in this guide refer to the story as it appears in the anthology, The Story and Its Writer,

Gaurav Seth 5 years, 6 months ago

Summary of Happy Endings by  Sylvia Spencer​

Happy Endings by Sylvia Spencer is an inspirational and motivational poem.

In the first stanza the poet asks is there always a happy ending to every song or story? The poet then explains some people are happy, while others weep; and there are people who finish in glory.

In the second stanza the poet reiterates there may not be a happy ending to every day. We may be sad or it might be raining and the sky might be grey due to which we might miss the sunshine of the clear sky.

In the third stanza the poet wisely suggests to us that happy endings may not happen by chance, but we can make happy endings by the quality of our work and positive attitude.  

In the last stanza the poet advises us to be ourselves, however small we may be. We should always smile when things get out of tune. We should try to make a happy ending out of everything. When we do this life will be like a continuous honeymoon.  

  • 5 answers

Priyesh Rai 5 years, 5 months ago

No, all things not float on water Wood float on water but coins does not float on water it sinks in water.

N.A.Sahana N.A.Sahana 5 years, 6 months ago

No all things does not flow on water ex: stone ,

Sakshi Balaji Battalwad 5 years, 6 months ago

No all the things do not flow on water on some things float on water .Ex:Wood, Plastic and etc

Yashashvi Kumare 5 years, 6 months ago

No not all things float on water

Visalatchi S 5 years, 6 months ago

No
  • 1 answers

Yogita Ingle 5 years, 6 months ago

The first plotter was invented in 1953 by Remington-Rand. It was used in conjunction with the UNIVAC computer to created technical drawings.

  • 1 answers

Ruby Khan 5 years, 6 months ago

T
  • 1 answers

Kids Fancy Dresses Hamirpur 5 years, 5 months ago

Alexander Graham Bell Alexander Graham Bell patented his first electric loudspeaker (capable of reproducing intelligible speech) as part of his telephone in 1876, which was followed in 1877 by an improved version from Ernst Siemens.  Loudspeaker for home use with three types of dynamic drivers Mid-range driver Tweeter Woofers The hole below the lowest woofer is a port for a bass reflex system. A loudspeaker is an electroacoustic transducer;[1] a device which converts an electrical audio signal into a corresponding sound.[2] The most widely used type of speaker is the dynamic speaker. The sound source (e.g., a sound recording or a microphone) must be amplified or strengthened with an audio power amplifier before the signal is sent to the speaker. The dynamic speaker was invented in 1924 by Edward W. Kellogg and Chester W. Rice. The dynamic speaker operates on the same basic principle as a dynamic microphone, but in reverse, to produce sound from an electrical signal. When an alternating current electrical audio signal is applied to its voice coil, a coil of wire suspended in a circular gap between the poles of a permanent magnet, the coil is forced to move rapidly back and forth due to Faraday's law of induction, which causes a diaphragm (usually conically shaped) attached to the coil to move back and forth, pushing on the air to create sound waves. Besides this most common method, there are several alternative technologies that can be used to convert an electrical signal into sound. Speakers are typically housed in a speaker enclosure or speaker cabinet which is often a rectangular square box made of several forms of wood, or sometimes plastic. The enclosure's materials and design play an important role in the quality of the sound. The enclosure generally must be as stiff and non-resonant as practically possible. Where high fidelity reproduction of sound is required, multiple loudspeaker transducers are often mounted in the same enclosure, each reproducing a part of the audible frequency range (picture at right). In this case, the individual speakers are referred to as drivers and the entire unit is called a loudspeaker. Drivers made for reproducing high audio frequencies are called tweeters, those for middle frequencies are called mid-range drivers and those for low frequencies are called woofers. Extremely low frequencies (16Hz-~100Hz) may be reproduced by separate subwoofers. Smaller loudspeakers are found in devices such as radios, televisions, portable audio players, computers, and electronic musical instruments. Larger loudspeaker systems are used for music, sound reinforcement in theatres and concert halls, and in public address systems.
  • 1 answers

Yogita Ingle 5 years, 6 months ago

In Germany, around 1440, goldsmith Johannes Gutenberg invented the printing press, which started the Printing Revolution.

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