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The period of a sine wave is 40ms. What is the frequency?(a) 25(b) 50(c) 75(d) 100This question was posed to me in an online interview.This intriguing question originated from Angular Relation of a Sine Wave in chapter Introduction to Alternating Currents and Voltages of Network Theory

Answer»

The correct option is (a) 25

The explanation is: We know that the frequency and time PERIOD are INVERSELY PROPORTIONAL to each other. So f = 1/T = 1/40ms = 25HZ.



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