Question

In the following questions, a statement of assertion followed by the reason is given. Choose the correct answers out of the following choices:

Assertion: Sound wave represents only density change when it moves in a medium.

Reason: Only the density of the medium at a given time varies with distance.

• A. Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
• B. The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
• C. Assertion is true but the Reason is false.
• D. The statement of the Assertion is false but the Reason is true.
• E. Both the statements are false.

Answer 1

The correct option is E

Both the statements are false.

1. A sound wave is a form of energy that flows from one point to another.
2. This flow of energy is in the form of waves.
3. Sound wave is a longitudinal wave in which particles of the medium vibrate along the direction of wave motion.
4. Flow of sound waves is in the form of compression and rarefaction.
5. Compression- It is a region of high pressure and high density in a wave motion.
6. Rarefaction- It is a region of low pressure and low density in a wave motion.
7. The sound wave represents both density change and pressure change when it moves in a medium.
8. Both pressure and the density of the medium at a given time vary with distance.
9. Thus, Both statements are wrong.
10. Hence, option E is correct.