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Answer to Question #64002 in Mechanics | Relativity for hamid

Question #64002
a siren emitting a note of frequency n is fitted on a police van, traveling towards a stationary listener. What is the velocity of the van, if the frequency of the note heard by the listener is double the original frequency?
a) Vs = V
b) Vs=V/2
c) Vs = 2V
d) Vs=V/3
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