The observen moving with velocity "vo", towards the stationary source of sound and then after crossing moves away from the source with velocity vo Assume that the medium through which the sound wemes travel is at rest. If 'v' is the velocity of the sound and 'n' is the frequency emitted by Sounce then clifference between apparent frequencies heard by the observe is - d). invo a). anvo b) nvo c). anvo
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