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

• What is the relationship between frequency and wavelength?
• Why does higher frequency light have more energy?
• How does ultraviolet (UV) light's frequency affect its interaction with microorganisms?

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.