Which of the following is required to facilitate the measurement of time?
A periodic event
A wave with high energy
Both B and C
A device calibrated to measure time
A
A wave with high energy
B
A periodic event
C
Both B and C
D
A device calibrated to measure time
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Solution
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In order to facilitate the measurement of time, a periodic event is required along with a device to calibrate the measured time. Thus option D is correct.
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