Let a is the first term and d is the common difference .


(m - n) = -2a(m-n)/2 -(m-n)(m+n)/2+(m-n)d/2
1 = -2a/2 - (m+n)/2 + d/2
1 = -1/2 {2a + (m+n-1)d} ---------(1)


from equation (1)
S_{m+n} = -(m+n)

Because the n.c.e.r.t has not given the line of quantum number but thank you for the link

https://youtu.be/TIxiDESxc0I ☝️☝️☝️☝️☝️Chemistry 3.1 Introduction to the Periodic Table – YouTube ...................,........................... https://courses.lumenlearning.com/boundless-chemistry/chapter/the-periodic-table/

Can you don't tell according to n.c.e.r.t lines which can be easier for understanding

ANSWER=................. Prediction of Period ⟶ In the electronic configuration of an atom, the principal quantum number (n) of the valence electrons represents the period of an element..... .. .. . ... ... ... Prediction of Block ⟶ The orbital out of s,p,d and f which receives the last electron represents the block of an element.............................. ....................... Prediction of Group ⟶ The group prediction occurs with the help of block as:- ............................................... (1) For s block: Group Number = Number of valence e− ......................... (2) For d block: Group Number = Number of e− in (n−1)d subshell + number ............................ of e− in ns subshell ..... ... . (3) For p block: Group Number = Number of valence e−+10 ...... B..... (4) For f-block: Group Number = 3 (always) ........ For example for chlorine with Z=17 ....... ... Electronic configuration = 1s22s22p63s23p5 .. .... Since the last e− enters in p - subshell: ...... ... (i) ∴ Block will be ′p′ . ...... (ii) For group we have element in p-block ... .. ∴ Group number = 10+ Valence e− in s subshell + Valence e− in p subshell . ... . . . Group Number = 10+2+5=17 . . (iii) For period . . The quantum number of valence e−=3 .. . ∴ Period number = 3

Par Aapne isme=ke baad wala kyu nhi Likha h

Solution:

LHS = 

Divide numerator and denominator by cosQ , we get

= 

=

/* By Trigonometric identity:

Sec²Q-tan²Q = 1 */

= 

= 

= 

= 

After cancellation, we get

= 

Multiply numerator and denominator by (secQ-tanQ), we get

= 

= 

= 

= RHS

Thanks ?

The radius of 1^st circle, r₁ = 21/2 cm (as diameter D is given as 21 cm)

So, area of gold region = π r₁² = π(10.5)² = 346.5 cm²

Now, it is given that each of the other bands is 10.5 cm wide,

So, the radius of 2^nd circle, r₂ = 10.5cm+10.5cm = 21 cm

Thus,

∴ Area of red region = Area of 2^nd circle − Area of gold region = (πr₂²−346.5) cm²

= (π(21)² − 346.5) cm²

= 1386 − 346.5

= 1039.5 cm²

Similarly,

The radius of 3^rd circle, r₃ = 21 cm+10.5 cm = 31.5 cm

The radius of 4^th circle, r₄ = 31.5 cm+10.5 cm = 42 cm

The Radius of 5^th circle, r₅ = 42 cm+10.5 cm = 52.5 cm

For the area of n^th region,

A = Area of circle n – Area of circle (n-1)

∴ Area of blue region (n=3) = Area of third circle – Area of second circle

= π(31.5)² – 1386 cm²

= 3118.5 – 1386 cm²

= 1732.5 cm²

∴ Area of black region (n=4) = Area of fourth circle – Area of third circle

= π(42)² – 1386 cm²

= 5544 – 3118.5 cm²

= 2425.5 cm²

∴ Area of white region (n=5) = Area of fifth circle – Area of fourth circle

= π(52.5)² – 5544 cm²

= 8662.5 – 5544 cm²

= 3118.5 cm²

I think so you can buy book online if the shop is not near from your house and there will be some discount in online shopping if you want to buy a book which cost low

Disadvantages of Verbal Communication

Following are the disadvantages of Verbal Communication:
➨Emotions are visible and hence leads to trouble in certain cases. 
➨It has no legal validity and hence will lead to problems in certain situations. 
➨It does not provide permanent record unless it is recorded with modern means of storage. 
➨It has issues when communicating with distant people. 
➨It is difficult for certain people to understand speech due to various speech tones used in verbal communication. 
➨This form of communication is not suitable for lengthy message.

There are 7 C’s of effective communication which are applicable to both written as well as oral communication. These are as follows:

 

1. Completeness - The communication must be complete. It should convey all facts required by the audience. The sender of the message must take into consideration the receiver’s mind set and convey the message accordingly.
2. Conciseness - Conciseness means wordiness, i.e, communicating what you want to convey in least possible words without forgoing the other C’s of communication. Conciseness is a necessity for effective communication.
3. Consideration - Consideration implies “stepping into the shoes of others”. Effective communication must take the audience into consideration, i.e, the audience’s view points, background, mind-set, education level, etc. Make an attempt to envisage your audience, their requirements, emotions as well as problems. Ensure that the self-respect of the audience is maintained and their emotions are not at harm. Modify your words in message to suit the audience’s needs while making your message complete. 
4. Clarity - Clarity implies emphasizing on a specific message or goal at a time, rather than trying to achieve too much at once.
5. Concreteness - Concrete communication implies being particular and clear rather than fuzzy and general. Concreteness strengthens the confidence.
6. Courtesy - Courtesy in message implies the message should show the sender’s expression as well as should respect the receiver. The sender of the message should be sincerely polite, judicious, reflective and enthusiastic.
7. Correctness - Correctness in communication implies that there are no grammatical errors in communication.

1.Development in information technology 2. Effective globalisation as reforms techology 3. Reach of telecommunication towers to everywhere 4.reach of internet to everywhere as it reforms communication

They are the most obvious barriers to effective communication. These barriers are mostly easily removable in principle at least. They include barriers like noise, closed doors, faulty equipment used for communication, closed cabins, etc. Sometimes, in a large office, the physical separation between various employees combined with faulty equipment may result in severe barriers to effective communication.

Cultural Barriers of Communication

As the world is getting more and more globalized, any large office may have people from several parts of the world. Different cultures have a different meaning for several basic values of society. Dressing, Religions or lack of them, food, drinks, pets, and the general behaviour will change drastically from one culture to another.

Attitude Barriers

Certain people like to be left alone. They are the introverts or just people who are not very social. Others like to be social or sometimes extra clingy! Both these cases could become a barrier to communication. Some people have attitude issues, like huge ego and inconsiderate behaviours.

Perception Barriers

Different people perceive the same things differently. This is a fact which we must consider during the communication process. Knowledge of the perception levels of the audience is crucial to effective communication. All the messages or communique must be easy and clear. There shouldn’t be any room for a diversified interpretational set.

Physiological Barriers

Certain disorders or diseases or other limitations could also prevent effective communication between the various channels of an organization. The shrillness of voice, dyslexia, etc are some examples of physiological barriers to effective communication. However, these are not crucial because they can easily be compensated and removed.

Verbal communication is any communication that uses words to share information with others. These words may be both spoken and written. 

On the basis of the communication channels, types of communications are:

1. Verbal
2. Non-Verbal
3. Visual

Verbal

This involves the use of language and words for the purpose of passing on the intended message. In general terms, Verbal Communication means communication in the form of spoken words only. But, in the context of types of communication, verbal communication can be in the spoken or the written form

Non-Verbal Communication

In this type of communication, messages are relayed without the transmission of words. The messages here are wordless messages. This form of communication mainly aides verbal communication. It supplements it with gestures, body language, symbols, and expressions.

Physical Non-verbal Communication

This is the sum total of the physically observable. For instance, hand gestures, body language, facial expressions, the tone of one’s voice, posture, stance, touch, gaze, and others. Several researchers have revealed that physical nonverbal communication constitutes about 55% of our daily communications.

Two vertices of an equilateral triangle are (0, 0) and (3, √3).

Let the third vertex of the equilaterla triangle be (x, y)

Distance between (0, 0) and (x, y) = Distance between (0, 0) and (3, √3) = Distance between (x, y) and (3, √3)

√(x² + y²) = √(3² + 3) = √[(x - 3)² + (y - √3)²]
x² + y² = 12
x² + 9 - 6x + y² + 3 - 2√3y = 12
24 -  6x - 2√3y = 12
- 6x - 2√3y = - 12
3x + √3y = 6
x = (6 - √3y) / 3
⇒ [(6 - √3y)/3]2 + y2 = 12
⇒ (36 + 3y2 - 12√3y) / 9 + y2 = 12
⇒ 36 + 3y2 - 12√3y + 9y2 = 108
⇒ - 12√3y + 12y2 - 72 = 0
⇒ -√3y + y2 - 6 = 0
⇒ (y - 2√3)(y + √3) = 0
⇒ y = 2√3 or - √3
If y = 2√3, x = (6 - 6) / 3 = 0
If y = -√3, x = (6 + 3) / 3 = 3
So, the third vertex of the equilateral triangle = (0, 2√3) or (3, -√3).

(0,4)

The lawyer had got a job as junior assistant clerk in a very good law firm. But he hated his job because he was not given the job for preparing law cases instead he was sent to the sinister areas of the city to look people and serve them summons. These people are so harsh and rude that they even beat up the lawyer.

Answer: lawyer had got a job as junior assistant clerk in a very good law firm. But he hated his job because he was not given the job for preparing law cases instead he was sent to the sinister areas of the city to look people and serve them summons.

(i) When Indian leaders were arrested, angry crowds demonstrated in the streets of Peshawar, facing armoured cars and police firing. Many were killed.
(ii) A month later, when Gandhiji himself was arrested, industrial workers attacked police posts, government buildings, law courts and railway stations and all structures that symbolised the British rule.
(iii) A frightened government responded with a policy of brutal repression. Peaceful satyagrahis were attacked, women and children were beaten, and about 100,000 people were arrested.
(iv) To break the deadline between Congress and the government Lord Irwin invited Gandhiji for a peace pact i.e Gandhi-Irwin pact.
(v) Under such a situation Gandhiji decided to call off the movement.

Seeing the angry reaction of the people against the arrest of Congress leaders, Lord Irwin made a pact with Gandhiji that if the Civil Disobedience movement would be called off, then the political prisoners would be released. Hence Gandhiji decided to call off the movement.

The African-American Civil Rights Movement (1954-1968) refers to the social movements in the United States aimed at outlawing racial discrimination against Black Americans and restoring voting rights to them.
The emergence of the Black Power Movement, (BPM) which lasted roughly from 1966 to 1975, enlarged the aims of the Civil Rights Movement (CRM) to include racial dignity, economic and political self-sufficiency and freedom from oppression by White Americans.
The movement was characterised by major campaigns of civil resistance. Between 1955 and 1968, acts of non-violent protest and civil disobedience produced crisis situations between activists and government authorities.
Federal, state and local governments, businesses and communities often had to respond immediately to these situations that highlighted the inequities faced by African-Americans. Martin Luther King Junior was the most prominent leader in the African-American Civil Rights Movement. He thought that Black Americans, as well as other disadvantaged Americans should be compensated for historical wrortgs.

The civil rights movement in the United States was a decades-long struggle by African Americans and their like-minded allies to end institutionalized racial discrimination, disenfranchisement and racial segregation in the United States,....,.The civil rights movement was a struggle for justice and equality for African Americans that took place mainly in the 1950s and 1960s. It was led by people like Martin Luther King Jr., Malcolm X, the Little Rock Nine and many others. ......1954 – 1968 Civil rights movement/Periods

Hemoglobin is important for the human body because it carries oxygen from lungs to other tissues of the body. It also helps in transporting carbon dioxide back to the lungs. It is used for calculating the number of red blood cells in the human body.

Haemoglobin present in our blood which makes blood to look red in colour.

Haemoglobin is present in red blood cells and they carry oxygen from lungs to other parts of our body, and also transportation of CO2 and H back to lungs.
Our most of the part of body iron is found in RBC's of our blood called haemoglobin and in muscles cells it's called myoglobin.
Haemoglobin has 4 polypeptide subunits, 2 alpha chains and 2 beta chains. It has 2 dimers which binds to oxygen.

Hcf of 224

• The first half of the 18th century saw an enormous increase in population all over Europe. The employment opportunities were very scarce as there more job seekers than employment.
•   Population from rural areas migrated to the cities to live in overcrowded slums.
•   Small producers in town were often faced with stiff competition from imports of cheap machine-made goods.
•   In Europe, the aristocracy still enjoyed power, peasants struggled under the burden of fuedal dues and obligations.
•  The rise of food price and bad harvest led to widespread pauperism around the country.

✔️ Small producers in town were often faced with stiff competition from imports of cheap machine-made goods. ✔️ In Europe, the aristocracy still enjoyed power, peasants struggled under the burden of fuedal dues and obligations. ✔️ The rise of food price and bad harvest led to widespread pauperism around the country.

Yes you are right

IAS ka question h kya?

Site of photosynthesis is chlorophyll located in chloroplast which is present in leaves of plant

Photosynthesis occurs when plants use light energy to convert carbon dioxide and water into glucose and oxygen. Leaves contain microscopic cellular organelles known as chloroplasts. Each chloroplast contains a green-coloured pigment called chlorophyll.

Crow is black in colour with a very harsh voice and is believed to be a symbol of bad omen. Thinking of a crow brings very depressing and sorrowful pictures to our minds. A hemlock tree is a poisonous plant with small white flowers.

Simon Commission was sent back because it did not have any Indian Representatives on the board.The were all British. So it was said by the slogan " Go back Simon" and was rejected in India.

The commission arrived in British India in 1928 to study constitutional reform in Britain's largest and the most important possession. ... In November 1927, the British government appointed the Simon Commission to report on India's constitutional progress for introducing constitutional reforms, as promised.

Simon commission send back by India because there was not any single member of India and the commission for indians in this region indians send back the commission.

Simon Commission was a group appointed in November 1927 by the British government under Stanley Baldwin to report on the working of the Indian constitution established by the Government of India Act of 1919 and suggest reforms. The commission was boycotted by the Indian National Congress and most other Indian political parties as there was no Indian member in the Commission.

Simon commision was send back by India because there wasn't any member from india.