Question

Choose the correct statement?

• A. Only mechanical waves can be classified into transverse and longitudinal.
• B. All mechanical waves are transverse
• C. Sound in air is necessarily a longitudinal wave.
• D. Sound can never behave as a non-mechanical wave.

Answer 1

Answer: (C), (D)

The correct options are
C

Sound in air is necessarily a longitudinal wave.

D

Sound can never behave as a non-mechanical wave.

Non-mechanical wave e.g electromagnetic waves are classified as transverse.
Sound wave is a mechanical wave that requires a medium for its propagation. A mechanical wave can be longitudinal or transverse in nature.
Sound in gases or liquids must be longitudinal. In solids they can be transverse as well.