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July 5, 2015

Homework Help: physics

Posted by Chris Adison on Monday, April 21, 2008 at 7:58pm.

I need help with this question.

A commuter train blows its horn as it passes a passenger platform at a constant speed of 55.0 m/s. The train horn sounds at a frequency of 350 Hz when the train is at rest.
(a) What is the frequency observed by a person on the platform as the train approaches?

(b) What is the frequency observed by a person on the platform as the train recedes from him?

(c) What wavelength does the observer find in each case?

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