Amplitude

Definition

Amplitude is the maximum extent of a wave measured from its equilibrium position. It indicates the wave's energy and intensity.

5 Must Know Facts For Your Next Test

1. Amplitude is directly proportional to the energy of a wave; higher amplitude means more energy.
2. In electromagnetic waves, amplitude affects the brightness or intensity of light.
3. Amplitude does not affect the frequency or wavelength of an electromagnetic wave.
4. The unit of amplitude can vary based on the type of wave; for light waves, it is often measured in volts per meter (V/m).
5. In quantum mechanics, amplitude relates to the probability density of finding a particle in a particular state.

Review Questions

• What does amplitude indicate about a wave?
• How is amplitude related to the energy carried by an electromagnetic wave?
• Does changing the amplitude of an electromagnetic wave affect its frequency?

Related terms

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

Wavelength: The distance between successive crests or troughs of a wave, typically measured in meters.

Photon: \text{A quantum particle representing a quantum of light or other electromagnetic radiation with energy } E = h\nu\text{.}