A boy is moving along a circular track in anticlockwise sense. A point sound source moves along a regular hexagonal path. The centres of hexagonal track and the circular track coincide as shown in the figure. The source and boy starts from point B and A respectively such that P, A & B always lie on the same radial line. At what point, the frequency heard by the boy is minimum?

Just before C

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Just after C

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At the mid-point of BC

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None of these

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Solution

The correct option is A
Just before C

Just before reaching C, the component of velocity of source along line joining the source and boy is maximum and away.

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The correct option is A Just before C Just before reaching C, the component of velocity of source along line joining the source and boy is maximum and away.

The correct option is A
Just before C

Just before reaching C, the component of velocity of source along line joining the source and boy is maximum and away.