Frequency is the number of occurrences of a repeating event per unit of time. It is also occasionally referred to as temporal frequency for clarity, and is distinct from angular frequency. Frequency is measured in hertz which is equal to one event per second. The period is the interval of time between events, so the period is the reciprocal of the frequency. For example, if a heart beats at a frequency of 120 times a minute, the period, T—the interval at which the beats repeat—is half a second. Frequency is an important parameter used in science and engineering to specify the rate of oscillatory and vibratory phenomena, such as mechanical vibrations, audio signals, radio waves, and light.

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High frequency brain wave patterns in the motor cortex can predict an upcoming movement

New Research Flips Our Understanding of Ice Age Frequency

New Technology Converts Radio Frequency Signals into DC Electricity

The Baader Meinhof Phenomenon (Frequency Illusion) – A cognitive bias wherein, upon noticing or learning about something, an individual finds that it frequently emerges in the ensuing days, months, or years. Written by Matthias Laroche (Clinical Neuropsychiatry (MSc) from King's College London)

Fresh understanding of ice age frequency

Low-Frequency Bass Encourages Dancing

Low-frequency bass can't be heard, but it can fire up the dance floor: study

Want to fire up the dance floor? Play low-frequency bass

Scientists publish major study on near-Earth asteroids - Using delay-Doppler radar observations collected from the Arecibo Observatory between December 2017 and December 2019, the study includes 191 asteroids' radar cross sections and Doppler-frequency broadening

To break new ground with frequency combs, an innovation plays with the beat

Optical communications: New on-chip frequency comb is 100x more efficient

Frequency of premenstrual anxiety, mood swings a public health issue, study finds

Identical Twins Reveal Legalizing Recreational Cannabis Has Increased Frequency of Use by 20%

Boosting duration, intensity & frequency of physical activity may lower heart failure risk

Climate change is increasing frequency of fish mass die-offs

Frequency May Be The Key to The Optimal Exercise Regime. Here's Why

Association between decreased frequency of seeing friends and the onset of depressive symptoms among community-dwelling older adults: A longitudinal study

Associations between affective factors and high-frequency heart rate variability in primary care patients with depression

The Frequency Illusion: Why You’ll Probably Hear the Name Baader-Meinhof Again Soon

MIT Quantum Sensor Can Detect Electromagnetic Signals of Any Frequency