Wavelength

Definition

Wavelength is the distance between two consecutive points that are in phase on a wave, such as from crest to crest or trough to trough. It is typically denoted by the Greek letter lambda ($\lambda$) and is measured in meters.

5 Must Know Facts For Your Next Test

1. Wavelength ($\lambda$) is inversely related to frequency (f) and can be calculated using the equation $\lambda = \frac{v}{f}$, where v is the wave speed.
2. In electromagnetic waves, different wavelengths correspond to different types of radiation, such as visible light, infrared, and ultraviolet.
3. Wavelength determines the color of visible light; shorter wavelengths correspond to blue/violet light while longer wavelengths correspond to red light.
4. The wavelength of a wave affects its energy; shorter wavelengths have higher energy according to the formula $E = hf$, where h is Planck's constant.
5. In a medium, the wavelength of sound changes depending on the medium's properties like density and elasticity.

Review Questions

• What is the relationship between wavelength and frequency?
• How does wavelength affect the energy of a wave?
• What happens to the wavelength of sound when it travels from air into water?

Related terms

Frequency:

The number of complete oscillations or cycles a wave undergoes per unit time, measured in Hertz (Hz).

Amplitude:

The maximum displacement of points on a wave from its equilibrium position. It determines the wave's energy and intensity.

Wave Speed:

The speed at which a wave propagates through a medium. It is calculated by multiplying frequency ($f$) by wavelength ($\lambda$).