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March 30, 2015

Homework Help: Physics URGENT!!!

Posted by Anonymous on Sunday, December 2, 2012 at 4:02pm.

A commuter train passes a passenger platform at a constant speed of 31 m/s. The train horn is sounded at its characteristic frequency of 330 Hz.Assume the speed of sound is 343 m/s.
(a) What is the frequency detected by a person on the platform as the train approaches? (b) What frequency is detected by a person on the platform as the train recedes? (c) What overall change in frequency is detected by a person on the plat-form as the train moves from approaching to receding?
(d) What wavelength is detected by a person on the platform as the train approaches?

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