A crest is the point on a wave with the greatest positive value or upward displacement in a cycle. A trough is the opposite of a crest.
The crest.
The distance from crest to crest in a transverse wave is called a wavelength.
Wave Length
If you are referring to a sine wave, a crest is the point on a wave with the maximum value or upward displacement within a cycle. A trough is the opposite of a crest, so it is the minimum or lowest point in a cycle. See Photo: http://en.wikipedia.org/wiki/File:Crest_trough.svg
A crest is the point on a wave with the greatest positive value or upward displacement in a cycle. A trough is the opposite of a crest.
The crest.
The highest point of a transverse wave is known as the crest, while the lowest point is called the trough. When the crest of one wave strikes against the trough of another wave, the forces of energy working in opposite directions with cancel out the effects of each other.
crest
The distance from crest to crest in a transverse wave is called a wavelength.
Wave Length
If you are referring to a sine wave, a crest is the point on a wave with the maximum value or upward displacement within a cycle. A trough is the opposite of a crest, so it is the minimum or lowest point in a cycle. See Photo: http://en.wikipedia.org/wiki/File:Crest_trough.svg
It's not an idiom. It means just what it says -- something is on the crest of a wave. The crest is the top of the wave.
In a wave, it is called the wave length.
Crest.
The crest of a wave is its highest point, as opposed to the trough of a wave, which is its lowest point.
constructive interference