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Doppler question



Here's a doppler question.

I always thought motion was relative. Why is it if the source
emits a 440 hz and it moves towards the observer at 30 m/s, the
observer hears 482 hz.(c=345). But if the observer moves
towards a 440 hz sound source at 30 m/s, the observer hears 478
hz. Why are these two heard frequencies different? In both
questions the observer and the source are approaching each
other. What *conceptually* is going on here?


-tony
--
Tony Wayne Those that can, do,
wayne@pen.k12.va.us -those that understand, teach.