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15. A source of sound S of frequency 500Hz is situated between a stationary observer O and a wall ,moves towards the wall with a speed of 2 m/s . If the velocity of sound's is 332 m/s ,then the number of beats per second heard by the observer is(approximately |
| Answer» 15. A source of sound S of frequency 500Hz is situated between a stationary observer O and a wall ,moves towards the wall with a speed of 2 m/s . If the velocity of sound's is 332 m/s ,then the number of beats per second heard by the observer is(approximately | |