Which of these examples would be classified as a longitudinal wave?
a) x-ray
b) red light
c) shock wave
d) radio wave

The correct answer is C.

Explanation:

Mechanical wave is of two types: Longitudinal wave and Transverse wave.

Longitudinal wave is a wave in which the particle motion is parallel to the wave motion. For example, sound wave.

Transverse wave is a wave in which the particle motion is perpendicular to the wave motion. For example, light wave

X-ray: X-ray is an electromagnetic wave. It is a transverse wave.

Red light: It is a light. It is a transverse wave.

Shock wave: Shock wave is a high pressure wave produced by an object. It travels faster than the speed of sound. It is a longitudinal wave.

Radio wave: It is an electromagnetic wave. It is a transverse wave.

Therefore, the shock is longitudinal wave. The correct answer is C.

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explanation:

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