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Physics questions help

ejayy · 2015-04-07 14:00:22

Hi Im stuck on a question to do with the doppler effect, any help would be appreciated! Here it is: A train driver sounds a train siren, which has a frequency of 350Hz, as a train travelling at a constant speed approaches a level crossing. While the train is approaching the crossing, a person standing beside the crossing…

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07-04-2015 3:00pm

#1

ejayy

Registered Users Posts: 221 ✭✭

Join Date: January 2014

Posts: 204

Hi Im stuck on a question to do with the doppler effect, any help would be appreciated!

Here it is:
A train driver sounds a train siren, which has a frequency of 350Hz, as a train travelling at a constant speed approaches a level crossing. While the train is approaching the crossing, a person standing beside the crossing hears a sounds with a frequency of 400Hz from the siren.
i) Whats the speed of the approaching train?
ii) By how much does the frequency of the sound the person beside the crossing hears from the train siren change as the train passes by them?

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#2 09-04-2015 2:09pm
amen

Registered Users Posts: 2,781 ✭✭✭

Join Date: October 1999

Posts: 2598

what you have tried so far?

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