A police siren emits a sinusoidal wave with frequency `f_(S) = 300 H_(z)` . The speed of
Channel: Doubtnut
Date: 2020-07-12

A police siren emits a sinusoidal wave with frequency `f_(S) = 300 H_(z)` . The speed of the sound is `340 m//s`. (a) Find the wavelength of the waves if siren is at rest in the air . (b) If the siren is moving at `30 m//s`, Find the wavelength of the waves ahead of and behind the source.