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A siren emitting sound of frequency 800Hz is going away from a static listener with a speed of 30m/s. Frequency of the sound to be heard by the listener is (Take velocity of sound as 330m/s).

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A siren emitting sound of frequency 800Hz is going away from a static listener with a speed of 30m/s. Frequency of the sound to be heard by the listener is (Take velocity of sound as 330m/s).

(a) 733.3Hz

(b) 644.8Hz

(c) 481.2Hz

(d) 286.5Hz

This question was posed to me in my homework.

The doubt is from Beats topic in division Waves of Engineering Physics I

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Right answer is (a) 733.3Hz

The explanation is: γ^‘=v/(v+vs)×γ=330/(330+30)×800

=733.3Hz.

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