# Frequency

Frequency measures the number of times something occurs in a specific amount of time. For example, if someone visits the grocery store twice a week, her shopping frequency is 2 visits per week. While frequency can be used to measure the rate of any action, in technical applications it is typically used to measure wave rates or processing speed. These frequencies often occur multiple times per second and therefore are measured in hertz (Hz) or related units of measurement, such as megahertz or gigahertz.

#### Wave Rates

Frequency can be used to measure the rate of waves, such as sound waves, radio waves, and light waves. Audible sound waves have a frequency of roughly 20 Hz to 20,000 Hz (20 kilohertz). Therefore, the sounds you hear have waves that occur anywhere from 20 to 20,000 times per second. Lower frequencies produce low-pitched sounds and are called bass frequencies. Higher frequencies produce high-pitched sounds and are called treble frequencies.

Sound waves are compression waves, which actually move small amounts of air particles. Other waves, such as radio waves and light waves do not require air particles to travel. These waves are part of the electromagnetic spectrum and generally have much higher frequencies than sound waves. For example, most radio waves are measured in megahertz (1,000,000 hertz) or gigahertz (1,000,000,000 hertz). Visible light has a frequency of about 400 terahertz to 780 terahertz.

#### Processing Speed

In the computer world, frequency is often used to measure processing speed. For example, clock speed, measures how many cycles a processor can complete in one second. If a computer has a 3.2GHz processor, it can can complete 3,200,000,000 cycles per second. FLOPS, which is used to measure floating point performance, is also a frequency-based calculation (operations per second). Finally, computing speed may also be defined in MIPS, which measures instructions per second.

What issue is a screen saver meant to prevent?

A
Screen burn-in
0%
B
Eye strain
0%
C
Flickering images
0%
D
Electrical interference
0%
Correct! Incorrect!     View the Screen Saver definition.
More Quizzes →

## The Tech Terms Computer Dictionary

The definition of Frequency on this page is an original definition written by the TechTerms.com team. If you would like to reference this page or cite this definition, please use the green citation links above.

The goal of TechTerms.com is to explain computer terminology in a way that is easy to understand. We strive for simplicity and accuracy with every definition we publish. If you have feedback about this definition or would like to suggest a new technical term, please contact us.