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A source of sound of frequency 256 Hz is...

A source of sound of frequency 256 Hz is moving towards a wall with a velocity of 5 m/s. How many beats per second will be heard by an observer O standing in such a positoin that the source S is between O and wall? `(c=330(m)/(s)`)

A

7.8 Hz

B

7.7 Hz

C

3.9 Hz

D

zero

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