Frequency

Definition

Frequency is the number of waves that pass a fixed point in a given unit of time, typically measured in hertz (Hz). It determines the energy and type of light in the electromagnetic spectrum.

5 Must Know Facts For Your Next Test

1. Higher frequency light has more energy than lower frequency light.
2. Frequency is inversely proportional to wavelength; as frequency increases, wavelength decreases.
3. Visible light spectrum ranges from approximately 400 THz to 789 THz.
4. Ultraviolet (UV) light has a higher frequency than visible light, which allows it to penetrate cells and cause damage.
5. Microorganisms can be visualized using different frequencies of light, including UV and infrared.

Review Questions

Related terms

Wavelength:

The distance between consecutive peaks or troughs in a wave.

Electromagnetic Spectrum:

The range of all types of electromagnetic radiation from gamma rays to radio waves.

Hertz (Hz): The unit of frequency in the International System of Units (SI), equivalent to one cycle per second.