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Physics-

General

Easy

Question

A source of sound is travelling at $fraction numerator 100 over denominator 3 end fraction m s to the power of negative 1 end exponent$ along a road, towards a point A When the source is 3m away from A,a person standing at a point O on a road perpendicular to the track hears a sound of frequency ‘ν’.The distance of O from A at that time is 4m.If the original frequency is 640 Hz, then the value of ν is (given velocity of sound $open equals 340 m s to the power of negative 1 end exponent close parentheses$

620 Hz
680 Hz
720 Hz
840 Hz

The correct answer is: 680 Hz

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