# physical science

you are standing on a street corner, and you hear a fire truck approaching. does the pitch of the siren stay constant, increase, or decrease as it approaches you? does the pitch of the siren stay constant, increase, or decrease as it moves away?

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1. Try some of the following links for information:

http://search.yahoo.com/search?fr=mcafee&p=the+pitch+of+a+siren+as+it+approaches+and+moves+away

Sra

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