Question

the wavelength of a wave is the distance between
a) two consecutive crests.
b) the amplitude and the normal position.
c) the crest and the following trough.
d) the rarefaction

Explanation:

To determine the correct answer, we recall the definition of wavelength. The wavelength of a wave is the distance between two consecutive identical points on the wave, such as two consecutive crests (or two consecutive troughs).

• Option A: Two consecutive crests are identical points on a wave, and the distance between them is the wavelength. This matches the definition.
• Option B: The amplitude is the maximum displacement from the normal (equilibrium) position, not related to wavelength.
• Option C: The distance between a crest and the following trough is half a wavelength, not the full wavelength.
• Option D: The option is incomplete, but rarefaction is related to compressional waves (like sound) and the distance between rarefactions (or compressions) is the wavelength, but since this option is incomplete, it's not correct.

So the correct answer is A.

Answer:

A) two consecutive crests.