What is a crest ?

Explain reflection of transverse wave when a wave pulse is sent as a crest from. Denser to rares medium

Explain reflection of transverse wave when a wave pulse is sent as a crest from. Rarer to denser medium.

What is wavelength difference between a crest and tough ?

What is the path difference between the two waves,when the crest of one wave falls on the crest of the other?

A boat strikes waves of ocean having crest 100 m away. The wave velocity of crest is 20ms^-1 . What is the frequency of waves striking the boat ?