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Old Dec 5th 2008, 10:54 AM   #1
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Join Date: Nov 2008
Posts: 7
Wave

John is listening to a horn. He knows the
frequency of the horn is 664 Hz when both he
and the horn are at rest.
If John hears the hornís pitch at 697 Hz,
what must be true?
A) Both can be moving and have the same
speed.
B) Both can be moving and have different
speeds.
C) John is moving towards the horn at rest.
D) The distance between John and the horn
is increasing with time.
E) Both can be moving in the same direction.
F) Both can be moving, but in opposite di-
rections.
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