THIS IS NOT A CHEM PROBLEM BUT CHEGG WOULD NOT LET ME POT WITHOUT TAGGING A CLASS AND PHY 317K WOULDN'T SHOW UP
PART 1
017 (part 1 of 3) 5.0 points
A siren at rest has a frequency f0. Standing
at a crosswalk, a student hears a frequency f' from the siren in an approaching police car.
After the car passes, the observed frequency is f ''. Let the speed of the siren (or the car)
be vc, and the speed of sound be vs.What is the wavelength of the sound when
the siren is at rest?
1.
vc/f''
2.
vs/f''
3.
vs/f'
4.
vc/f'
5.
vc/(f' + f'')
6.
vs/(f' + f'')
7.
vs/f0
8.
vc/f0

(part 2 of 3)
If x =vc/vs, what is the frequency f''
heard by the student when the car is moving away?
1.
f0 *(1 + x)
2.
f0 *(1 - x)/(1 + x)
3.
f0
4.
f0/(1 - x)
5.
f0 *(1 - x)
6.
f0/(1 + x)
7.
f0(1 + x)/(1 - x)
8.
f0*x
(part 3 of 3)
If f'and f''are 600 Hz and 400 Hz, respectively, and the speed of sound in air is 340 m/s,
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