1.

A revolving ring in a siren revolves `420` times per minute and it produces `2` beats per second with a tuning fork of frequency `348 Hz`. Choose the correct statement from the following.A. No. of hole in ring `=49`.B. No. of hole in ring `=50`.C. Frequency of siren is `350 Hz`.D. Frequency of siren is `342 Hz`.

Answer» Number of revolutions in `1 "scc"=70`


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