What is the lowest point of a wave called?

The lowest point of a wave is known as a trough. This term specifically refers to the point where the wave reaches its minimum displacement from the rest position, which is the equilibrium level. In a wave, there are alternating peaks and troughs—where the peak represents the highest point of the wave and the trough denotes the lowest point. Understanding these terms is essential when studying wave properties, as they relate to the amplitude, wavelength, and overall behavior of waves in different mediums. Recognizing the role of the trough helps in analyzing wave phenomena such as interference and reflection.