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Frequency is a metric for expressing the rate of oscillation in a wave. For planar and longitudinal waves, this often expressed in oscillations-per-second or Hz. Angular frequency used for expressing rates of rotation, similar to revolutions-per-second, and is usually expressed in radians-per-second. It can be thought of as a wave with a constant amplitude where the amplitude rotates in a circle in space.

The two differ by factor of 2*Pi.

Omega (angular frequency) = 2*Pi*f(frequency in Hz)

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Q: What is a difference between frequency and angular frequency?
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