1.

A whistle producing sound waves of frequencies 9500 Hz and is approaching a stationary person with speed v ms^(-1) The velocity of sound in air is 300 ms^(-1). If the person can hear frequencies upto a maximum of 10,000 Hz. The maximum value of v upto which he can hear the whistle is

Answer»

`30 MS^(-1)`
`15 sqrt2 ms^(-1)`
`15sqrt2 ms^(-1)`
`15 ms^(-1)`

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