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S 1 and S 2 are two identical sound sources of frequency 656 Hz . The source S 1 is located at O and S 2 moves anti-clockwise with a uniform speed 4 2 m s - 1 on a circular path around O , as shown in the figure. There are three points P , Q and R on this path such that P and R are diametrically opposite while Q is equidistant from them. A sound detector is placed at point P . The source S 1 can move along direction

Correct answer

0

Step-by-step solution

Given: Source frequency, f 0 = 656   Hz . Velocity of sound = 324   m   s - 1 . Velocity component of the source moving away from detector along like P Q , V s = 4 2 cos 45 o = 4   m   s - 1 . Therefore, apparent frequency, f = v v + v s f 0 = 324 324 + 4 656 ⇒ f = 648   Hz

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