Question

Following statements which are true for light waves but not for sound waves are/is

(I) The speed of waves is greater in vacuum than in a medium
(II) Waves of different frequencies travel with different speeds in a medium
(III) Waves travel with different speeds in different media.

• A. (I) only
• B. (I) and (III)
• C. (II) and (III)
• D. (I), (II) and (III)

Answer 1

The correct option is A (I) only

Statements (ii) and (iii) are true for both light waves as well as sound waves statement (1) is true only for light waves because sound waves require a medium for propagation while light waves can travel in the vacuum.
Hence, the answer is (1) only