pulse
A crest is a single rise in a wave, while a trough is a single depression.
A single rise or depression in a series of waves is called a crest or a trough, respectively. Crests are the highest points of a wave while troughs are the lowest points.
The depression or low place between the crests of a wave is called a trough. It is the lowest point in the wave pattern, situated below the equilibrium level of the water.
consumerism
the rise of unemployment was because of the great depression because the owners didn't need workers when the stock market crashed.
A long narrow depression between waves is known as a trough. It is the lowest point of a wave where the water level is at its lowest. Troughs are followed by wave crests, the highest points in a wave.
The multiple reflection of a single sound wave is an echo.
A wave pulse is a single disturbance or variation that travels through a medium, carrying energy without carrying matter. It is a single, non-repeating wave that can be produced by a single event or source.
The Great Depression and World War 1 unresolved issues contributed to the rise of the dictators of Mussolini, Hitler, and Franco.
The frequency of a sound wave is the characteristic of the wave that gives rise to the sensation of pitch, assuming that the wave is not so complex that it is perceived as white noise.
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Depression