A train moving towards a tunnel in a huge mountain with a speed of 12m/s sounds its whistle. If the driver hears 6 beats per second and speed of sound in air is 332 m/s,the frequency of whistle is how much

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Q. A train moving towards a tunnel in a huge mountain with a speed of 12 m/s sounds its whistle. Sound is reflected from the mountain. If the driver hears 6 beats per second & speed of sound in air is 332 m/s, the frequency of the whistle is

Q. A train approaching a platform at a speed of 54 km/h sounds a whistle. An observer on the platform finds its frequency to be 1620 Hz. The train passes the platform keeping the whistle on and without slowing down. What frequency will the observer hear after the train has crossed the platform? The speed of sound in air = 332 m/s.

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