Question

Which letter on the diagram below represents the trough of a wave?

A. A

B. B

C. C

D. D

Answer 1

A would be the wavelength, C would be a crest, D would be the amplitude, leaving B which is the trough.

Answer 2

Answer: B. B

Step-by-step explanation:

The trough is B because it is the "minimum" amplitude of a wave since amplitude is D which is the displacement of wave from its initial position. The minimum value of the amplitude will be at B which is the trough.

Note that the maximum value of the amplitude will be the crest which at C.