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April 19, 2014

April 19, 2014

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

(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?

- Physics URGENT!!! -
**Jennifer**, Monday, December 3, 2012 at 8:31pmfo=(1/(1±vs/v))fs

Where the plus sign is negative if the source is approaching the observer and positive if the source is moving away from the observer.

fo is frequency of the observer

fs is the frequency of the source

vs is the speed of the source

v is the speed of sound

a) So as the train approaches,

fs = (1 / (1 - 31/343))*330

b) As the train recedes,

fs = (1 / (1 + 31/343))*330

c) The overall change in frequency is the answer in part a minus the answer in part b

d) The wavelength lamda is given by

lamda = v/f

where v is the speed of sound, and f is the frequency.

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