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Physics-

General

Easy

Question

A boy is moving along a circular track in anticlockwise sense. A children train moves along a square path with centres of circular track and square both coinciding, as shown in the figure. the train as well as the boy start from points B and A such that points O, A and B always lie on the same radial line. The velocity of listener is 11 m/s. The train continuously whistles at frequency 300 Hz. during one such complete rotation the maximum and minimum frequency heard by the boy. are respectively ( Take velocity of sound 330 m/s)

$\frac{9000}{30 - 2 \sqrt{2}} H z, \frac{9000}{30 + 2 \sqrt{2}} H z$
$\frac{9000}{30 - 4 \sqrt{2}} H z, \frac{9000}{30 + 4 \sqrt{2}} H z$
$\frac{6000}{30 - 2 \sqrt{2}} H z, \frac{6000}{30 + 2 \sqrt{2}} H z$
$\frac{6000}{30 - 4 \sqrt{2}} H z, \frac{6000}{30 + 4 \sqrt{2}} H z$

The correct answer is: $fraction numerator 9000 over denominator 30 minus 2 square root of 2 end fraction H z comma fraction numerator 9000 over denominator 30 plus 2 square root of 2 end fraction H z$

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