SOLUTION: A siren that has a normal frequency of 1500 hertz is approaching you at 80 mph. What is the pitch that you will hear?

Question 319696: A siren that has a normal frequency of 1500 hertz is approaching you at 80 mph. What is the pitch that you will hear?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
You didn't specify a temperature or altitude to determine the speed of sound.
I'll use 700 mph as the speed of sound.
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Frequency
The equation for the observed frequency of sound when the source is traveling toward you is:
fo = fv/(v − vt)
where
fo is the observed frequency
f is the emitted frequency
v is the velocity of sound
vt is the velocity of the source toward you
v > vt (vt is less than v)
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fo = 1500*700/(700 - 80)
fo =~ 1694 Hz

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