Two trains are travelling towards each other both at a speed of 90 km h -1 . If one of the trains sounds a whistle at 500 Hz, what will be the apparent frequency heard in the other train? Speed of sound in air = 350 m s -1 .

Two trains are travelling towards each other both at a speed of 90 km h^-1. If one of the trains sounds a whistle at 500 Hz, what will be the apparent frequency heard in the other train? Speed of sound in air = 350 m s^-1.

The apparent frequency heard by the other train is given by,

Here,

V=350 ms^-1

V₀=90kmph = 25ms^-1

f₀ = 500 Hz

So,

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