1.

What should be the velocity of a sound source moving towards a stationary observer so that apparent frequency is double the actual frequency (Velocity of sound is v) [MP PMT 2002]

A.            v    
B.            2v
C.            \[\frac{v}{2}\]                      
D.            \[\frac{v}{4}\]
Answer» D.            \[\frac{v}{4}\]


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