Question

Two trains A and B are moving towards each other with a speed of 432 km/h. If the frequency of the whistle emitted by A is 800 Hz, then what is the apparent frequency of the whistle heard by the passenger sitting in train B. (The velocity of sound in air is 360 m/s).​

Answer 1

Answer:Correct option is A

Explanation:

Correct option is A

Given : V0=720km/h=720×36001000=200m/s

vs=−720km/h=200m/s

v=350m/s

δ=1100hz

By Doppler effect formula

δ1=δ(V+VsV−V0)(source and listener are moving away from each other)

=1100(350+200350−200)

=5501100×150

=300Hz

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