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(A): A medium must have elasticity to su...

(A): A medium must have elasticity to support wave motion.
(R): Restoring force responsible for wave motion results due to elasticity of the medium.

A

Both 'A' and 'R' are true and 'R' is the correct, explanation of 'A'.

B

Both 'A' and 'R' are true and 'R' is not the correct explanation of 'A'

C

A' is true and 'R' is false

D

Both 'A' and 'R' are false

Text Solution

AI Generated Solution

The correct Answer is:
To analyze the assertion and reason given in the question, we will break down the concepts step by step. ### Step 1: Understanding the Assertion **Assertion (A)** states that "A medium must have elasticity to support wave motion." - **Explanation**: For any wave to propagate through a medium, the medium must be able to return to its original shape after being disturbed. This property is known as elasticity. Without elasticity, the medium would not be able to support the oscillations that characterize wave motion. ### Step 2: Understanding the Reason **Reason (R)** states that "Restoring force responsible for wave motion results due to elasticity of the medium." - **Explanation**: When a wave travels through a medium, particles of that medium are displaced from their equilibrium positions. The restoring force, which is the force that brings the particles back to their equilibrium positions, arises due to the elastic properties of the medium. For example, in a stretched spring, when you pull it and release it, the spring returns to its original shape due to the restoring force provided by its elasticity. ### Step 3: Connecting Assertion and Reason - The assertion (A) and reason (R) are closely related. The elasticity of a medium is what allows for the existence of a restoring force, which is essential for wave motion. Therefore, the reason provides a valid explanation for the assertion. ### Step 4: Conclusion Based on the analysis: - Both the assertion (A) and the reason (R) are true. - The reason (R) is a correct explanation of the assertion (A). ### Final Answer Both the assertion and reason are true, and the reason is the correct explanation of the assertion. ---
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AAKASH SERIES-WAVES-EXERCISE-IB (Assertion (A) & Reason (R) Type Questions)
  1. Assertion : The frequencies of incident, reflected and refracted beam ...

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  2. (A): Only longitudinal waves can propagate through a gas. (R): Gase...

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  3. (A): A medium must have elasticity to support wave motion. (R): Rest...

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  4. (A): Both transverse and longitudinal mechanical waves can travel thro...

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  5. Statement-1 : Mechanical transverse waves cannot be generated in gaseo...

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  6. (A): In a progressive wave particle velocity and wave velocity are sam...

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  7. (A): Wave velocity and particle velocity for transverse wave are mutua...

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  8. (A): If in the presence of two independent audio signals, no beats are...

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  9. (A): When a wave goes from one medium to other, average power transmit...

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  10. (A): If two waves of same amplitude, produce a resultant wave of same ...

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  11. Assertion : On reflection from a rigid boundary there takes place a co...

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  12. (A) : The wave length of sound waves increases when they are refracted...

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  13. Statement I:In a progressive logitudinal wave, the amplitude of the wa...

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  14. (A): Two sound waves of frequencies 400 Hz and 200 Hz can propagate wi...

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  15. Statement 1: Sound waves can not propagate through vacuum but light wa...

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  16. (A): The velocity of sound changes as we go up in the atmosphere. (R...

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  17. Assertion : The flash of lightening is seen before the sound of thund...

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  18. (A): A wind is different from the sound wave in air. (R): The wind i...

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  19. (A): The velocity of sound in hydrogen gas is more than the velocity o...

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  20. Assertion : Sound would travel faster on a not summer day than on a co...

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