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Observer A is at rest. Source `S_(1)` is moving towards observer A and source `S_(2)` is moving away from observer A. velocity of sound is `330(m)/(sec)`. `beta`= beat frequency heard per second by A. Approximate value of `beta` is:

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The correct Answer is:
2
`beta=33(330/(330-10)-330/(330+10))`
`=33(330(2xx10))/((330)^(2)-(10)^(2))`
then `beta=33xx20/300=2Hz`
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