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NEET UG PHYSICS MCQ: WAVES

1 Easy
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Application +4 | -1
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 2,000 Hz2,000 \mathrm{~Hz}, then the frequency heard by the observer will be
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Correct option: B
1990 Hz1990 \mathrm{~Hz}
Option B (1990 Hz1990 \mathrm{~Hz}) is correct because the frequency heard by the observer decreases as the ambulance moves away, according to the Doppler effect.

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