the vertical distance between trough and crest is called
Wave Measurement The highest point of a wave is called the crest. The lowest point is. called the trough. Wave height is the vertical distance between the. crest and trough. Wavelength is the horizontal distance between. waves in a series. Wavelength can be measured between two wave. crests. It can be measured between two wave troughs. The period of a wave is a length of time-the time it takes for. successive wave crests to pass a certain point.