A source of sound `S` of frequency 500 Hz situated between a stationary observer `O` and wall `W`,
Channel: Doubtnut
Date: 2020-01-19

A source of sound `S` of frequency 500 Hz situated between a stationary observer `O` and wall `W`, moves towards the wall with a speed of `2m//s`. If the velocity of sound is `332m//s`. Then the number of beats per second heard by the observer is (approximately)