What is frequency?

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BE(Electronics)

The number of cycles per unit of time is called the frequency.frequency is measured in the hertz unit
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Tutor

Frequency describes the number of waves that pass a fixed place in a given amount of time. So if the time it takes for a wave to pass is is 1/2 second, the frequency is 2 per second. If it takes 1/100 of an hour, the frequency is 100 per hour.
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PCM & Computer Science Expert.

How many times a thing happens in a specified time can be called the frequency of happening of that event.
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Professional Chemistry Teacher for IIT JEE/NEET UG,Online expert for IB/IGCSE/AP CURRICULUM

No.of radiations passing from a source in the form of waves in a 1 second is called frequency.
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The rate per second of a vibration constituting a wave, either in a material (as in sound waves), or in an electromagnetic field (as in radio waves and light)....
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