The disc of a Siren has n holes and the ...

The disc of a Siren has n holes and the frequency of its rotation is 300 r.p.m. It produces a note of wavelength 2.4m., when the velocity of sound in air is 360 m/s. The value of n is

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A bat flies at steady speed of 4" m s"^(-1) emitting a sound of f=90xx10^(3) . Hz It is flying horizontally towards a vertical wall. The frequency of the reflected sound as detected by the bat will be (Take velocity of sound in air as 330" m s"^(-1) )

The apparent frequency of a note when an observer moves towards a stationary source with a velocity 20 m/s in 200 Hz . Calculate the actual frequency of a note . Calculate wavelength if velocity of sound is 350 m/s .

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