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[" 98.A train is moving with a constant ...

[" 98.A train is moving with a constant speed along a "],[" circular track.The engine of the train emits a "],[" sound of frequency f.The frequency heard by the "],[" guard at rear end of the train."],[" (a) Is less than "fquad " (b) Is greater than "f],[" (c) Is equal to "f],[" (c) May be greater than,less than or equal to "f],[" depending on the factors like speed of train,length "],[" of train snd radius of circular track."]

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