21. One sine wave has a period of 2 ms, another has a period of 5 ms, and other has a period of 10 ms. Which sine wave is changing at a faster rate ?
(a) sine wave with period 2 ms
(b) sine wave with period of 5 ms
(c) all are at all same rate
(d) sine wave with period of 10 ms
Answer : (a)
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