The observer is moving with velocity 
towards the stationary source of sound and then after crossing moves away from the source with velocity 
. Assume that the medium through which the sound waves travel is at rest. If 
is the velocity of sound and 
is the frequency emitted by the source then the difference between apparent frequencies heard by the observer is
Text Solution
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The frequency heard by the observer, when moving towards the stationary source
The frequency heard by the observer, when moving away from the stationary source
The difference between apparent frequencies 
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