A source of frequency 900 Hz moves towards a stationary observer at 34 m/s. If the speed of sound is 340 m/s, the frequency heard is
A. 1000 Hz
B. 810 Hz
C. 990 Hz
D. 1100 Hz
1 answer
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Answer: A. 1000 Hz
\(n'=n\frac{v}{v-v_s}=900\times\frac{340}{306}=1000\) Hz.
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· 23 Oct 2026
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