Question

Sound travels in air if

• A. Particles of medium travel from one place to another
• B. There is no moisture in the atmosphere
• C. Disturbance moves
• D. Both particles as well as disturbance travel from one place to another

Answer 1

The correct option is C

Disturbance moves

Explanation for the correct option:

1. Sound is a wave that moves along the medium of transmission in the form of vibrations.
2. It is a longitudinal wave meaning that the particles vibrate parallel to the direction of the wave.
3. It is the propagation of disturbance from one place to another.

Hence, option C is correct.

Explanation for incorrect options:

Option A: Movement of particles from one point to another is called motion. The important fact is that, in a sound wave, the particles of the medium vibrate about a fixed point, not just move linearly.

Hence, option A is incorrect.

Option B: Sound needs a physical medium to travel. The presence or absence of moisture has no importance. It can propagate with moisture as well.

Hence, option B is incorrect.

Option D: As mentioned earlier, sound does not propagate by the linear motion of particles.

Hence, option D is incorrect.

Therefore, option C is correct.