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physicsnewby
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Homework Statement
A radio played on a moving train has frequency of 85 Hz. A second radio played at train station is at rest. What is the beat frequency heard if train approaches the station at 10 m/s?
Homework Equations
f' = [f \ (1-vsource/vsound)
I used this equation because the source is moving towards a stationary object.
The Attempt at a Solution
f' = 85 \ (1 - 10\343)
f' = 85\ 0.971
f' = 88 Hz
The answer is 2.5. So, I think I'm missing a second equation. However, if the source is moving towards the object I assumed the question was asking what the beat freq. would be heard at the station.