If a period is 0.00125 s, what is the frequency?

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Multiple Choice

If a period is 0.00125 s, what is the frequency?

Explanation:
Frequency is how many cycles occur in one second, and it’s the reciprocal of the period: f = 1 / T. With a period of 0.00125 s, f = 1 / 0.00125 = 800 Hz. (0.00125 s is 1.25×10^-3, whose reciprocal is (1/1.25)×10^3 = 0.8×10^3 = 800.) So the signal repeats 800 times each second. If you change the period, the frequency changes accordingly—for example, a longer period gives a smaller frequency, and a shorter period gives a larger frequency.

Frequency is how many cycles occur in one second, and it’s the reciprocal of the period: f = 1 / T. With a period of 0.00125 s, f = 1 / 0.00125 = 800 Hz. (0.00125 s is 1.25×10^-3, whose reciprocal is (1/1.25)×10^3 = 0.8×10^3 = 800.) So the signal repeats 800 times each second. If you change the period, the frequency changes accordingly—for example, a longer period gives a smaller frequency, and a shorter period gives a larger frequency.

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