Discussion
If the period of a signal is 1000 ms, then what is its frequency in kilohertz ?
Answer: A
The frequency of a signal is the reciprocal of its period. A period of 1000 ms is 1 second, so the frequency is 1 hertz, which is \(10^{-3}\) kilohertz, since 1 kHz is 1000 Hz. So the answer is option (A). The other values, \(10^{-2}\), \(10^{-1}\) and 1 kilohertz, are 10 hertz, 100 hertz and 1000 hertz, which belong to periods of 100 ms, 10 ms and 1 ms, so they do not match the period given.
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