A source of sound with natural frequency f 0 moves uniformly along a straight line separated from a stationary observer by a distance ' ℓ ' (perpendicular distance). The velocity of source

Question

A source of sound with natural frequency $f_{0}$ moves uniformly along a straight line separated from a stationary observer by a distance ' $ℓ$ ' (perpendicular distance). The velocity of source is half of velocity of sound. Find the frequency (in Hz) of sound received by the observer at the moment when the source gets closest to him?

(Take f₀ = 250.00Hz )

TestHub · Accepted Answer

AB = η ct AO = ct cos θ = AO AB ​ = η f = f 0 ​ { c − V S ​ cos θ c ​ } = f 0 ​ { c − ηc × n c ​ } = 1 − η 2 f 0 ​ ​ = 3 250 × 4 ​

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