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[" 7.An observer is moving with speed "v...

[" 7.An observer is moving with speed "v_(0)" towards a "],[" stationary source emitting a sound wave of "],[" wavelength "lambda" .The change in wavelength detected "],[" by the observer is "(v=" speed of sound) "],[[" (1) "(lambda v)/(v_(0))," (2) "(lambda v_(0))/(v)],[" (3) "(lambda v_(0)^(2))/(v)," (4) Zero "]]

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