# AC Fundamentals – 59

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59. If a sine wave goes through 10 cycles in 20 μs, the period is ________.

(a) 20 s
(b) 4 s
(c) 2 s
(d) 100 s

Explanation
Explanation :

f = frequency
t = time period
p = period

f = 1 / t
Frequency = cycles per second

p = t / cycles
Period = time per cycle

Period = 20 μs / 10 = 2 μs.

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