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Home  >>  JEEMAIN and AIPMT  >>  Physics  >>  Class11  >>  Oscillations
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The sound source of frequency 400 Hz is moving towards as stationary observer with a velocity of 40 m/s . The frequency heard by the observer is (The speed of sound in medium is 340 Hz .)


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Answer : (b) $\;453\;Hz$
Explanation :
By Doppler's effect
$v\;$ - velocity of sound
$v_{s}\;$ - velocity of source
$f^{|}=\large\frac{340}{340-40}\times400=\large\frac{340}{300} \times 400$
answered Mar 8, 2014 by yamini.v

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