CBSE > Class 10 > Science | CBSE Board | Homework Help

Refractive index of a transparent medium decreases with increase in wavelength of the incident light used.
Refractive index of glass with respect to air is given
μ=Speed of light in air/speed of light in glass =3×10⁸m/s/ 2×10⁸ m/s=1.5
Now,
μ=1/siniC

⇒siniC= 1/μ
iC=sin−1(1/μ)=sin−1(1/1.5)=sin−1(2/3).

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What importance of the DNA copying reproduction

Posted by Om Prakash 5 years, 1 month ago

CBSE > Class 10 > Science

4 answers

Maheen Khan Khan 5 years, 1 month ago

The importance of DNA? copying in reproduction is that dna copy gave a great variation in living organism...to survive in adverse Condition.....

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King Adithya H M... 5 years, 1 month ago

DNA determines the body design of an individual. The DNA that gets transferred from parents to offsprings makes them look similar. DNA copying is important for reproduction. Additional copies of DNA are made during replication which is necessary for the new cells formed after cell division.

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Astha Soni 5 years, 1 month ago

Importance of DNA copying in reproduction is that the characteristics of the parent organism are transmitted to its offsprings and at the same time some occasional variation are also produced in the offsprings.

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Gaurav Seth 5 years, 1 month ago

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My mother is boxer anybody's mother has power to fight with my mother my mother beat his mother brutally

Posted by Risabh Kholi 5 years, 1 month ago

CBSE > Class 10 > Science

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What is reason for the generation of large amount non biodegradable waste.

Posted by Elizabeth Mary 5 years, 1 month ago

CBSE > Class 10 > Science

1 answers

Pardhan Ji 5 years, 1 month ago

Aap jaise aadmi hi iska jimmedar hai

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Effects in use of non biodegradable waste on environment

Posted by Elizabeth Mary 5 years, 1 month ago

CBSE > Class 10 > Science

2 answers

Yogita Ingle 5 years, 1 month ago

Effects of nonbiodegradable substances

(i) They pollute water and harms the aquatic life.

(ii) Non biodegradable substances like radioactive wastes, lead accumulate in the environment and cause diseases in humans and other living beings.

(iii) Substances like plastics, etc enter into the food chain and harm the organisms.

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King Adithya H M... 5 years, 1 month ago

The microorganisms that break it down can cause disease and produce harmful gases. Non-biodegradable materials are often synthetic products like plastic, glass and batteries. Because they don't break down easily, if not disposed of properly, non-biodegradable waste can cause pollution, block drains and harm animals.

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Effects in uses of non biodegradable wastes on human health.

Posted by Elizabeth Mary 5 years, 1 month ago

CBSE > Class 10 > Science

2 answers

King Adithya H M... 5 years, 1 month ago

Air Contamination Paper, plastics and other materials that are burned can contaminate the air when they are burned. ... If they contain toxic chemicals like dioxin they can reach the air that people breathe and cause a public health risk. Garbage that is disposed of improperly can also begin to release methane gases.

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Sanket Sundar 5 years, 1 month ago

Problems occur due to use of wastes that we generate are: 1) Clogging of drains2) S oil Destruction 3) Death of cattle due to ingestion of plastics. 4) Ecological imbalance. 5) Air pollution. 6) Water pollution.

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Effects in use of non biodegradable wastes in human life.

Posted by Elizabeth Mary 5 years, 1 month ago

CBSE > Class 10 > Science

2 answers

King Adithya H M... 5 years, 1 month ago

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Sanket Sundar 5 years, 1 month ago

Biodegradable wastes pollute the environment only when they are in excess in the environment. ... They generate a large amount of microbial flora around the wastes. These microbes can cause many communicable diseases in humans,

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What is mendel

Posted by Shreya Aggarwal 5 years, 1 month ago

CBSE > Class 10 > Science

2 answers

Akshika Agrvanshi 5 years, 1 month ago

Mendal is a name of scientists. The Gregor Johan mendal. He give gentecis

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Elizabeth Mary 5 years, 1 month ago

Gregor Johann Mendel is a scientist. He is the father of bio genetics

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Mujae ek question ka answer cahae but uskae law ur classification ek saaat nahi hone cahae the question ? Mandeleev periodic law and classification?

Posted by Virender Singh 5 years, 1 month ago

CBSE > Class 10 > Science

1 answers

King Adithya H M... 5 years, 1 month ago

Dmitri Ivanovich Mendeleev, a Russian scientist arranged the elements in increasing order of their relative atomic masses. He was honoured with Noble prize in 1906 for his Periodic Table. Mendeleev’s Periodic Law states that the properties of elements are the periodic function of their relative atomic masses. Mendeleev arranged all 63 elements; which were discovered till his time; in the order of their increasing relative atomic masses in a tabular form. It is known as Mendeleev’s Periodic Table. He divided the table in eight columns and seven rows. The columns are known as groups and rows are known as periods.

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My mother is boxer anybody's mother has power to fight with my mother

Posted by Risabh Kholi 5 years, 1 month ago

CBSE > Class 10 > Science

1 answers

Devraj Singh 5 years, 1 month ago

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Long form of periodic table

Posted by Virender Singh 5 years, 1 month ago

CBSE > Class 10 > Science

1 answers

Gaurav Seth 5 years, 1 month ago

The modern or long form of the periodic table is based on the modern periodic law. The table is the arrangement of elements in increasing order of their atomic numbers. The modern periodic table is the present form of the periodic table. And it consists of 18 vertical columns and 7 horizontal rows.

Modern Periodic Table

Groups in the Modern Periodic Table

Groups are the vertical columns in the modern or long form of the periodic table.
There are 18 groups in the periodic table.
These groups are numbered from 1 to 18.
Each group consists of elements having the same outer shell electronic configuration.

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Mendeleevs periodic law and its classification

Posted by Virender Singh 5 years, 1 month ago

CBSE > Class 10 > Science

1 answers

Gaurav Seth 5 years, 1 month ago

Dmitri Ivanovich Mendeleev, a Russian scientist arranged the elements in increasing order of their relative atomic masses. He was honoured with Noble prize in 1906 for his Periodic Table.

Mendeleev’s Periodic Law states that the properties of elements are the periodic function of their relative atomic masses.

Mendeleev arranged all 63 elements; which were discovered till his time; in the order of their increasing relative atomic masses in a tabular form. It is known as Mendeleev’s Periodic Table. He divided the table in eight columns and seven rows. The columns are known as groups and rows are known as periods.

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Newland law of octaves

Posted by Virender Singh 5 years, 1 month ago

CBSE > Class 10 > Science

3 answers

Malaika Sharma 5 years, 1 month ago

It is the arrangement of elements done by Newland in which 8 elements were arranged in such a way that every 8th element has properties same as the first one.

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Virender Singh 5 years, 1 month ago

BOOK FREE CLASS COMPETITIVE EXAMS BNAT Classes CBSE NCERT Solutions Commerce ICSE IAS JEE NEET State Boards Government Exams Kids Learning Academic Questions Online Tuition Full Forms CAT BUY A COURSE +919243500460 Chemistry Chemistry Articles Periodic Table Named Reactions Chemistry Laws Chemistry Important Questions Chemistry Classification of Elements and Periodicity in Properties Newlands Law Of Octaves Newland’s Law of Octaves and Dobereiner’s Triads Dobereiner’s triads and Newland’s law of octaves were early attempts at classifying elements into groups based on their properties. Since many new elements were discovered over the course of the 18th and 19th centuries, the broad classification of elements into metals and non-metals became inefficient. Several experiments were conducted in order to identify elements with similar properties and group them together. It is important to note that the primitive methods of classifying elements, such as Newland’s law of octaves and Dobereiner’s triads, laid the foundation for the development of the modern periodic table. What are Dobereiner’s Triads? Dobereiner’s triads were groups of elements with similar properties that were identified by the German chemist Johann Wolfgang Dobereiner. He observed that groups of three elements (triads) could be formed in which all the elements shared similar physical and chemical properties. Dobereiner stated in his law of triads that the arithmetic mean of the atomic masses of the first and third element in a triad would be approximately equal to the atomic mass of the second element in that triad. He also suggested that this law could be extended for other quantifiable properties of elements, such as density. The first of Dobereiner’s triads was identified in the year 1817 and was constituted by the alkaline earth metals calcium, strontium, and barium. Three more triads were identified by the year 1829. These triads are tabulated below. Triad 1 This triad was made up of the alkali metals lithium, sodium, and potassium. TriadAtomic MassesLithium6.94Sodium22.99Potassium39.1 The arithmetic mean of the masses of potassium and lithium corresponds to 23.02, which is almost equal to the atomic mass of sodium. Triad 2 As mentioned earlier, calcium, barium, and strontium formed another one of Dobereiner’s triads. TriadAtomic MassesCalcium40.1Strontium87.6Barium137.3 The mean of the masses of barium and calcium corresponds to 88.7. Triad 3 The halogens chlorine, bromine, and iodine constituted one of the triads. TriadAtomic MassesChlorine35.4Bromine79.9Iodine126.9 The mean value of the atomic masses of chlorine and iodine is 81.1. Triad 4 The fourth triad was formed by the elements sulfur, selenium, and tellurium. TriadAtomic MassesSulfur32.1Selenium78.9Tellurium127.6 The arithmetic mean of the masses of the first and third elements in this triad corresponds to 79.85. Triad 5 Iron, cobalt, and nickel constituted the last of Dobereiner’s triads. TriadAtomic MassesIron55.8Cobalt58.9Nickel58.7 However, the mean of the atomic masses of iron and nickel corresponds to 57.3. Limitations of Dobereiner’s Triads The key shortcomings of Dobereiner’s method of classifying elements are listed below. The identification of new elements made this model obsolete. Newly discovered elements did not fit into the triads. Only a total of 5 Dobereiner’s triads were identified. Even several known elements did not fit into any of the triads. Owing to these shortcomings, other methods of classifying elements were developed. Newland’s Law of Octaves In the year 1864, the British chemist John Newlands attempted the 62 elements known at that time. He arranged them in an ascending order based on their atomic masses and observed that every 8th element had similar properties. On the basis of this observation, Newland’s law of octaves was formulated. The law of octaves states that every eighth element has similar properties when the elements are arranged in the increasing order of their atomic masses. An illustration detailing the elements holding similar properties as per Newland’s law of octaves is provided below. Newlands compared the similarity between the elements to the octaves of music, where every eighth note is comparable to the first. This was the first attempt at assigning an atomic number to each element. However, this method of classifying elements was met with a lot of resistance in the scientific community. Limitations of Newland’s Law of Octaves The key shortcomings of Newland’s law of octaves are listed below. Several elements were fit into the same slots in Newland’s periodic classification. For example, cobalt and nickel were placed in the same slot. Elements with dissimilar properties were grouped together. For example, the halogens were grouped with some metals such as cobalt, nickel, and platinum. Newland’s law of octaves held true only for elements up to calcium. Elements with greater atomic masses could not be accommodated into octaves. The elements that were discovered later could not be fit into the octave pattern. Therefore, this method of classifying elements did not leave any room for the discovery of new elements. To learn more about Newland’s law of octaves and Dobereiner’s Triads along with other related concepts, such as Mendeleev’s periodic table, register with BYJU’S and download the mobile application on your smartphone. CHEMISTRY Related LinksIodoform TestAcid Rain Causes And EffectsChloroform FormulaFirst Order ReactionGalvanic CellWashing Soda FormulaNomenclature Of Coordination CompoundsExamples Of BasesWhat Are AtomsWhat Is Platinum Important Chemistry Topics Periodic Table Of Elements Aufbau Principle Electron Configuration Isomerism Planck's Quantum Theory Valence Bond Theory Reactivity Series Named Reactions Dipole Moment Thermal Conductivity Mole Concept Tyndall Effect Balancing Chemical Equations Electromeric Effect Electrochemical Cell Boyle's Law CBSE Sample Papers CBSE Sample Papers Class 8 Science CBSE Sample Papers Class 9 Science CBSE Sample Papers Class 10 Science CBSE Sample Papers Class 11 Physics CBSE Sample Papers Class 11 Chemistry CBSE Sample Papers Class 11 Biology CBSE Sample Papers Class 12 Physics CBSE Sample Papers Class 12 Chemistry CBSE Sample Papers Class 12 Biology CBSE Previous Year Question Papers CBSE Previous Year Question Papers Class 10 Science CBSE Previous Year Question Papers Class 12 Physics CBSE Previous Year Question Papers Class 12 Chemistry CBSE Previous Year Question Papers Class 12 Biology ICSE Sample Papers ICSE Sample Papers Class 8 Physics ICSE Sample Papers Class 8 Chemistry ICSE Sample Papers Class 8 Biology ICSE Sample Papers Class 9 Physics ICSE Sample Papers Class 9 Chemistry ICSE Sample Papers Class 9 Biology ICSE Sample Papers Class 10 Physics ICSE Sample Papers Class 10 Chemistry ICSE Sample Papers Class 10 Biology ISC Sample Papers Class 11 Physics ISC Sample Papers Class 11 Chemistry ISC Sample Papers Class 11 Biology ISC Sample Papers Class 12 Physics ISC Sample Papers Class 12 Chemistry ISC Sample Papers Class 12 Biology ICSE Previous Year Question Papers ICSE Previous Year Question Papers Class 10 Physics ICSE Previous Year Question Papers Class 10 Chemistry ICSE Previous Year Question Papers Class 10 Maths ISC Previous Year Question Papers class 12 ISC Previous Year Question Papers Class 12 Physics ISC Previous Year Question Papers Class 12 Chemistry ISC Previous Year Question Papers Class 12 Biology Important Chemistry Articles Periodic Table Of Elements Aufbau Principle Electron Configuration

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Gaurav Seth 5 years, 1 month ago

In the year 1864, the British chemist John Newlands attempted the 62 elements known at that time. He arranged them in an ascending order based on their atomic masses and observed that every 8th element had similar properties. On the basis of this observation, Newland’s law of octaves was formulated.

The law of octaves states that every eighth element has similar properties when the elements are arranged in the increasing order of their atomic masses.

Newlands compared the similarity between the elements to the octaves of music, where every eighth note is comparable to the first. This was the first attempt at assigning an atomic<a href="https://byjus.com/chemistry/atomic-number-mass-number/"> </a>number to each element. However, this method of classifying elements was met with a lot of resistance in the scientific community

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How I remember biology I can't understand help me

Posted by Aman Kumar 5 years, 1 month ago

CBSE > Class 10 > Science

5 answers

Rani Kumari 5 years, 1 month ago

Try to understand not to remember

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Akhya Sahay 5 years, 1 month ago

Use learning acronyms or tricks.. And play study music in the background

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Balaji Nagar 5 years, 1 month ago

Study with CONCENTRATION and INTEREST

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Sumesh ☺️☺️☺️ 5 years, 1 month ago

Mujhe bhi nahi ati?

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Mahak Jingaliya 5 years, 1 month ago

calm down

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Life 3

Posted by Naushad Malik 5 years, 1 month ago

CBSE > Class 10 > Science

5 answers

Malaika Sharma 5 years, 1 month ago

Kehna Kya Chahte Ho??

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King Adithya H M... 5 years, 1 month ago

????? .., Life 3.0: Being Human in the Age of Artificial Intelligence is a book by Swedish-American cosmologist Max Tegmark from MIT. Life 3.0 discusses Artificial Intelligence and its impact on the future of life on Earth and beyond.

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King?Adithya H. M.. 5 years, 1 month ago

what????????

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Akhya Sahay 5 years, 1 month ago

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Sumesh ☺️☺️☺️ 5 years, 1 month ago

What?

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Give a brief discussion of the Mendeleevs periodic classification of elements

Posted by Virender Singh 5 years, 1 month ago

CBSE > Class 10 > Science

2 answers

Virender Singh 5 years, 1 month ago

Tankd

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Yogita Ingle 5 years, 1 month ago

Dmitri Ivanovich Mendeleev, a Russian scientist arranged the elements in increasing order of their relative atomic masses. He was honoured with Noble prize in 1906 for his Periodic Table.

Mendeleev’s Periodic Law states that the properties of elements are the periodic function of their relative atomic masses.

Elements are arranged in the periodic table in the increasing order of their relative atomic masses.
Mendeleev divided his periodic table in eight groups and seven periods.
Groups from I to VII are meant for normal elements and group VIII is for transition elements.
Groups from I to VII have been divided in two sub groups, while group VIII is meant for three elements.
Periods from 4th to 7th have been divided in two series: 1st series and 2nd series.
Elements having similar properties have been kept in the same group. For example; lithium, potassium, rubidium, etc. are in 1st group.

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All formula of ch electricity

Posted by Shivam Singh 5 years, 1 month ago

CBSE > Class 10 > Science

2 answers

Maheen Khan Khan 5 years, 1 month ago

P= w/q I= q/ t Ohms law v= R×i Parallel R= 1/R1 ×1\R2 Series R = R× R.

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Himani Yadav 5 years, 1 month ago

1) I=q/t 2)V=W/Q 3) V=IR 4) R= pl/ A 5) Rs= R1+R2+R3 6) 1/Rp= 1/ R1+ 1/ R2 + 1/ R3 7) H = I2Rt 8) P= W/t 9) P= VI 10) P = V2/ R

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What are fuels define fossil fuel how are they formed

Posted by Shivam Jha 5 years, 1 month ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 5 years, 1 month ago

Fossil fuels are the fuels formed by natural processes such as decomposition of dead and buried organisms.

Fossil fuels are buried flammable geologic deposits of organic substances such as dead plants, and animals that got deposited under several thousand feet of silt. These deposits decayed with the passage of time and got converted to natural gas, coal, and petroleum due to the extreme heat and pressure inside the earth’s crust. They are also known as non-renewable sources of energy as it takes a very long time for it to replenish.

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Consider the following food chain which occurs in a forecast Grass - Deer - Lion. If 10000 J of solar energy is available to the grass, how much energy would be available to the deer to transfer it to the lion?

Posted by Manoj Nair 5 years, 1 month ago

CBSE > Class 10 > Science

3 answers

Akhya Sahay 5 years, 1 month ago

Can you guys explain how you have calculated. I am feeling as I have not studied that chapter thoroughly.

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Disha Singh 5 years, 1 month ago

10 J of energy is available to the deer to transfer it to the lion.

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Himani Yadav 5 years, 1 month ago

By 10% law 1000J of energy is available in plant and 100J is available in lion.

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What is the height of alimentary cannel

Posted by Nikhil Maurya 5 years, 1 month ago

CBSE > Class 10 > Science

4 answers

Harsh Janghu 5 years, 1 month ago

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K K.... 5 years, 1 month ago

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Yogita Ingle 5 years, 1 month ago

The alimentary canal in human beings extends from mouth to ****. In human beings, it measures about 8 to 10 meters in length. Gastro-intestinal tract can be divided into upper tract and lower tract.

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Mayank Chaudhary 5 years, 1 month ago

Alimentary canal is the long tube of organs and it is about 8.6 to 8.9m long.

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Which is the most basic event of reproduction?

Posted by Adyasha Singsoy 5 years, 1 month ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 5 years, 1 month ago

Reproduction at its most basic level involves making copies of the blueprints of body design. During reproduction, the information for inheritance of characteristics is passed on from the parents to the offsprings in the form of DNA. DNA in the cell nucleus is the information. Hence DNA copying is the basic event in reproduction.

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Why magnetic field lines never intersect each other????

Posted by Neetu Kumari 5 years, 1 month ago

CBSE > Class 10 > Science

2 answers

King Adithya H M... 5 years, 1 month ago

If magnetic field lines intersect each other, then at the intersection point there will be two directions of the same field which is not possible. Hence the field lines do not cross or intersect each other.

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Gaurav Seth 5 years, 1 month ago

Answer:

Magnetic lines of force are defined as the curved lines which are used for representing the magnetic field. These lines do not exist but are imaginary lines through the pattern of the magnetic field is explained. These imaginary lines are assumed to originate from the north pole and reach to the south pole by travelling inside the magnet thereby completing the loop.

Properties of magnetic lines of force

Magnetic field lines originate from the north pole and merge at the south pole.
As the distance between the poles tends to increase, magnetic line density reduces.
Inside the magnet, the position of the field lines is from the South Pole to the North Pole.
Magnetic lines do not intersect with one another.
The magnetic lines strength is the same throughout, and it is proportional to how near the lines are.

Reason – The two magnetic field lines do not intersect each other because if they do it means at the point of intersecting the compass needle is showing two different directions which are not possible.

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What is potential difference ? What is insulators ? What is conductors ?

Posted by Ramanpreet Dhaliwal 5 years, 1 month ago

CBSE > Class 10 > Science

2 answers

Maheen Khan Khan 5 years, 1 month ago

Potential difference: potential difference between two point that is called potential difference.... Insulator: A substance in which current doesn't flow is called insulator... Conductor:. A substance in which current flow is called conductor....

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Yogita Ingle 5 years, 1 month ago

In a conductor, electrons flow only when there is a difference in electric pressure at its ends. This is also called potential difference. In a circuit, this potential difference is created by a battery.

Electrical conductor:An electrical conductor is a substance that allows an electrical current to pass through it. Electrical conductors are usually metals. Copper is one of the best electrical conductors, and this is why it is used to make conducting wire.

Insulators: An insulator is a non-conducting material that does not carry any charge.Examples of insulators are plastic and wood.

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yogita engel .i am vry appriciate u because u mostly answer all the questions u r vry intelligent and can u tell me the how u u r so intelligent .

Posted by Itz Raman Here ☺ 5 years, 1 month ago

CBSE > Class 10 > Science

0 answers

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what is a magnetic field

Posted by Yash Raj 5 years, 1 month ago

CBSE > Class 10 > Science

3 answers

King Adithya H M... 5 years, 1 month ago

A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetized materials. A charge that is moving in a magnetic field experiences a force perpendicular to its own velocity and to the magnetic field.

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Harisree Sadagopan 5 years, 1 month ago

region around a magnetic material or a moving electric charge within which the force of magnetism acts.

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Yogita Ingle 5 years, 1 month ago

A magnetic field is a vector field in the neighbourhood of a magnet, electric current, or changing electric field, in which magnetic forces are observable. A magnetic field is produced by moving electric charges and intrinsic magnetic moments of elementary particles associated with a fundamental quantum property known as the spin. Magnetic field and electric field are both interrelated to each other and are components of the electromagnetic force, one of the four fundamental forces of nature.

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