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Questions  >>  JEEMAIN and NEET  >>  Physics  >>  Class11  >>  Oscillations
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A sound source of frequency 400 Hz is moving towards an observer with a velocity of 50 m/s while the observer is moving away from the source with a velocity of 40 m/s . Find the frequency heard by the observer . (Velocity of sound is 340 m/s )

$(a)\;423.7\;Hz\qquad(b)\;391.6\;Hz\qquad(c)\;413.8\;Hz\qquad(d)\;405.7\;Hz$

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