Question

Which of the following statements are correct? (i) Sound is produced by vibrations. (ii) Sound requires a medium for propagation. (iii) Light and sound both require a medium for propagation. (iv) Sound travels slower than light.

• A. i & ii only
• B. i, ii & iii only
• C. ii, iii & iv only
• D. i, ii & iv only

Answer 1

The correct option is D

i, ii & iv only

Sound:

1. Only sound requires a medium to travel, whereas light can travel in a vacuum.
2. Because the molecules of solids, liquids, and gases carry sound waves from one point to another, sound requires a material medium such as solid, liquid, or gas to travel.
3. Because there are no molecules in the vacuum that can vibrate and carry sound waves, sound cannot travel through it.

Hence,Option(D) is correct.