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A whistle producing sound waves of frequencies 9500 Hz and above 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 up to a maximum of 10,000 Hz, the maximum value of v up to which the person can hear the whistle is

 
15 ms-1
15/ ms-1
15 ms-1


30 ms-1

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Explanation?