A disc siren with certain number of holes rotates uniformly 270 times – InterviewSolution

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1.	A disc siren with certain number of holes rotates uniformly 270 times in one and half minute. The frequency of the note emitted is 48 Hz. If the velocity of sound in air is 336 m s^(-1), find its wavelength and number of holes on the disc.
Answer» Solution :(i) `lamda = (V)/(n)`, No. of HOLES `= ("frequency")/("No. of RATATION in ONE sec")` (II) 16

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