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the ambulance produces sound with a frequency of 955 Hz. What<br />
is the wavelength of the sound reaching your ears?<br />
8. A speeder looks in his rear-view mirror. He notices that a police<br />
car has pulled up behind him and is matching his speed of 38 m/s.<br />
The siren on the police car has a frequency of 860 Hz when the<br />
police car and the listener are stationary. What frequency does the<br />
speeder hear when the siren is turned on in the moving police car?<br />
9. Two train whistles, A and B, each have a frequency of 444 Hz. A is<br />
stationary and B is moving toward the right (away from A) at a<br />
speed of 35.0 m/s. A listener is between the two whistles and is<br />
moving toward the right with a speed of 15.0 m/s.<br />
a) What is the frequency from A as heard by the listener?<br />
b) What is the frequency from B as heard by the listener?<br />
10. The siren of a fire engine that is driving northward at 30.0 m/s<br />
emits a sound of frequency 2000 Hz. A truck in front of this fire<br />
engine is moving northward at 20.0 m/s.<br />
a) What is the frequency of the siren’s sound that the fire<br />
engine’s driver hears reflected from the back of the truck?
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