Question

Explain the terms crest and trough in relation to the transverse wave.

ICSE Class 9 Physics Chapter Propagation of Sound

Answer 1

d position of max upward displacement is called crest
and
d position of max downward displacement is called trough

Answer 2

In transverse wave, particles oscillate in up and down directions; relative their normal position of rest. Particles of medium create elevation above the normal position or line of zero to the surface of medium and depression below the normal position in the course of oscillation. The elevation is called crest and the depression is called trough.