Wavelength

Definition

Wavelength is the distance between successive crests or troughs of a wave. It is typically represented by the Greek letter lambda ($\lambda$).

5 Must Know Facts For Your Next Test

1. Wavelength is inversely proportional to frequency: $\lambda = \frac{v}{f}$, where $v$ is the wave speed and $f$ is the frequency.
2. In a vacuum, the wavelength of light determines its color in the visible spectrum.
3. For sound waves in air, wavelength affects pitch; longer wavelengths correspond to lower pitches.
4. Wavelength can be measured in meters (m), centimeters (cm), or nanometers (nm) depending on the wave type and context.
5. The concept of wavelength applies to all types of waves, including mechanical waves like sound and electromagnetic waves like light.

Review Questions

• How does wavelength relate to wave speed and frequency?
• What happens to the wavelength if the frequency of a wave increases while its speed remains constant?
• Why is it important to understand wavelength in both sound and light waves?

Related terms

Frequency: The number of oscillations or cycles per unit time, typically measured in Hertz (Hz).

Amplitude: The maximum displacement from equilibrium position in a wave.

Wave Speed: The rate at which a wave propagates through a medium, calculated as $v = f \cdot \lambda$.