Two trains are moving towards each other at speeds of $$20$$ $$m/s$$ and $$15$$ $$m/s$$ relative to the ground. The first train sounds a whistle of frequency $$600$$ Hz. the frequency of the whistle heard by a passenger in the second train before the train meets is (the$$ speed of sound in air is $$340$$ $$m/s)

Question

Infinity Learn · Accepted Answer

The frequency of whistle heard by passenger in the train B, is n'$$=n$$ $$v+v0v$$−$$vs=600$$ $$340+15340$$−$$20$$≈$$666$$ Hz

Two trains are moving towards each other at speeds of 20 m/s and 15 m/s relative to the ground. The first train sounds a whistle of frequency 600 Hz. the frequency of the whistle heard by a passenger in the second train before the train meets is (the speed of sound in air is 340 m/s)

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