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An observer standing by the side of a road hears the siren of an ambulance, which is moving away from him. If the actual frequency of the siren is 2000Hz, then the frequency heard by the observer will be __________

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An observer standing by the side of a road hears the siren of an ambulance, which is moving away from him. If the actual frequency of the siren is 2000Hz, then the frequency heard by the observer will be __________

(a) 1990Hz

(b) 2000Hz

(c) 2100Hz

(d) 4000Hz

I got this question in a national level competition.

My doubt is from Beats in division Waves of Engineering Physics I

1 Answer

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Best answer
The correct choice is (a) 1990Hz

Explanation: γ^‘=1990

Apparent frequency decreases when the source moves away from the observer.

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