00:05Question says, which quantity is measured in Hertz, a loudness, b intensity of sound,
00:12c frequency, d time period, as loudness is measured in decibel, intensity of sound is
00:21measured in watt per meter square, and time period is measured in second, as frequency
00:28is the reciprocal of time period, so its unit is per second, which is also equal to Hertz,
00:36so frequency is measured in Hertz, the correct option is c frequency.
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