A source and an observer are situated on two perpendicular tracks as shown in the figure. The observer is at rest and the source is moving with a speed of 50 in s -1 . The source emits a sound wave of frequency 75 Hz, which travel in the medium with a velocity of 200 m s -1 . The frequency of the sound heard by the observer when the source crosses the origin is
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At the time of emission, if the source and observer line is making an angle 
with the line of motion of source, then
[As this sound is heard by observer when source is at 
]
Putting the values, fapp 
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