# Units of Frequency

Created by: Team Physics - Examples.com, Last Updated: April 25, 2024

## What are Units of Frequency?

Units of frequency measure how often an event occurs in a specific amount of time, typically in seconds. The base unit of frequency is the hertz (Hz), which represents one cycle per second.

## List of Frequency Units

1. Hertz (Hz)
2. Kilohertz (kHz)
3. Megahertz (MHz)
4. Gigahertz (GHz)
5. Terahertz (THz)
6. Petahertz (PHz)
7. Exahertz (EHz)
8. Zettahertz (ZHz)
9. Yottahertz (YHz)

### Hertz (Hz)

Definition: The base unit of frequency in the International System of Units (SI), representing one cycle per second. It measures how often an event happens over time.
Common Use: Used for describing the frequencies of audible sounds, and electrical signals.

### Kilohertz (kHz)

Definition: Equivalent to 1,000 hertz.
Common Use: Often used in radio frequency equipment, audio signals, and lower frequency electromagnetic waves.

### Megahertz (MHz)

Definition: Equal to 1,000,000 hertz or 1,000 kHz.
Common Use: Commonly used to describe the frequencies used in FM and TV broadcasting, as well as in the field of telecommunications like mobile phone frequencies.

### Gigahertz (GHz)

Definition: Equal to 1,000,000,000 hertz or 1,000 MHz.
Common Use: Typically used to describe the clock speeds of computer processors and the frequencies of microwave frequencies, including those used for cellular telephone signals.

### Terahertz (THz)

Definition: Equal to 1 trillion hertz (1,000,000,000,000 Hz).
Common Use: Terahertz radiation is utilized in scientific research, particularly in imaging and spectroscopy for materials science, security scanning, and biomedical applications.

### Petahertz (PHz)

Definition: Equal to 1 quadrillion hertz (1,000,000,000,000,000 Hz).
Common Use: These frequencies are primarily of interest in ultrafast science where researchers study the extremely fast processes such as the dynamics of chemical reactions and quantum physics phenomena.

### Exahertz (EHz)

Definition: Equal to 1 quintillion hertz (1,000,000,000,000,000,000 Hz).
Common Use: Not commonly used in practical applications but can describe theoretical studies and high-energy physics, including some forms of gamma radiation.

### Zettahertz (ZHz)

Definition: Represents frequencies in the order of 10^21 hertz.
Common Use: Like exahertz, this unit is not used in everyday applications but can relate to frequencies observed in astrophysical phenomena and some theoretical models.

### Yottahertz (YHz)

Definition: The largest frequency unit, representing 10^24 cycles per second.
Common Use: This unit is mainly theoretical and used in scientific research that explores the highest possible frequencies, far beyond the electromagnetic spectrum commonly used in technology today.

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