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May 30, 2015

Homework Help: Physics

Posted by Jon on Monday, April 7, 2008 at 2:01pm.

1)As a sound source moves away from a stationary observer, the number of waves will.

A)increase
B)decrease
C)remain the same
D)need to know the speed of the source

(answer:decrease.) As the detector recedes from the source, the relative velocity is smaller, resulting in a decrease in the wave crests reaching the detector each second. (thats from the book)


2)How fast should a car move toward you for the car's horn to sound 2.88% higher in frequency than when the car is stationary? The speed of sound is 343 m/s

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