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: A sound created in a big hall will persist by repeated reflection from the walls until it is reduced to a value where it is no longer audible.

Reason: Sound undergoes reflection.

• 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 A

Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

1. Sound undergoes reflection.
2. Sound is also a wave just like light.
3. The only difference is, that the sound is a mechanical as well as longitudinal wave, but the light is a non-mechanical as well as a transverse wave.
4. Sound wave bounces off a solid or a liquid like a rubber ball bounces off a wall.
5. This phenomenon is called a reflection of sound waves.
6. A sound created in a big hall will persist by repeated reflection from the walls, this phenomenon is called reverberation.
7. The sound will persist in reverberation until it is reduced to a value where it is no longer audible.
8. That means when all the energy is lost in the absorption on the walls due to multiple reflections, the sound will no longer be audible.
9. This phenomenon can be observed in cinema halls and auditoriums.
10. Thus, both the assertion and reason are correct and the reason is the correct explanation of the assertion.
11. Thus, option A is correct.