Amplitude

Definition

Amplitude is the maximum displacement of a point on a wave from its equilibrium position. It is a measure of the energy carried by the wave.

5 Must Know Facts For Your Next Test

1. Amplitude determines the loudness of sound waves and the brightness of light waves.
2. In a sinusoidal wave, amplitude is the distance from the midpoint to the crest or trough.
3. Amplitude does not affect the wavelength or frequency of a wave, but higher amplitude means more energy.
4. The unit of amplitude depends on what type of wave it is (e.g., meters for mechanical waves, volts for electrical waves).
5. When multiple waves interfere, their amplitudes can add constructively or destructively.

Review Questions

• What does amplitude measure in a wave?
• How does an increase in amplitude affect the energy of a wave?
• Does amplitude have any effect on the wavelength or frequency of a wave?

Related terms

Wavelength:

The distance between consecutive points in phase on a wave, such as from crest to crest.

Frequency:

The number of complete cycles of a wave that pass a point in one second, measured in Hertz (Hz).

Equilibrium Position:

The central position around which oscillations occur in a wave.