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Q.

Two trains are moving towards each other at speeds of 144 km/hr and 54 km/hr relative to the ground. The first train sounds a whistle of frequency 600 Hz. Find the frequency of the whistle as heard by a passenger in the second train before the trains meet. (v=340m/s)

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a

610 Hz

b

510 Hz

c

710 Hz

d

170 Hz

answer is C.

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Detailed Solution

The frequency of whistle heard by passenger in the train B, is

$n^{'} = (\frac{v + v_{o}}{v - v_{S}})$

$n^{'} = 600 (\frac{340 + 15}{340 - 40}) = 710 Hz$

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