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a narrow pulse for example a short pip b...

a narrow pulse for example a short pip by a whistle is sent across a medium. If the pulse rate is 1 after every 20 s, (that is the whistle is blown for a split of second after every 20 s), the frequency of the note produced by the whistle is

A

`1//20 Hz`

B

0.5 Hz

C

1 Hz

D

unknown

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