Frequency unit today is Hertz.

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Frequency unit today is Hertz.

Frequency tells you how many times a repeating event occurs each second. Today the SI unit for that rate is the hertz, abbreviated Hz, defined as one cycle per second. So saying frequency is measured in hertz is the standard. If you see radians per second, that’s angular frequency—rotation rate in terms of angles, not the count of cycles per second. Seconds per cycle is the period, which is the reciprocal of frequency and measures the time for one cycle rather than how many cycles occur each second. Therefore the correct statement is that the frequency unit today is Hertz.

Frequency tells you how many times a repeating event occurs each second. Today the SI unit for that rate is the hertz, abbreviated Hz, defined as one cycle per second. So saying frequency is measured in hertz is the standard. If you see radians per second, that’s angular frequency—rotation rate in terms of angles, not the count of cycles per second. Seconds per cycle is the period, which is the reciprocal of frequency and measures the time for one cycle rather than how many cycles occur each second. Therefore the correct statement is that the frequency unit today is Hertz.

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