While standing at a crosswalk, you hear a frequency of 540 Hz from an approaching police car. After the police car passes, its frequency is 480 Hz. What is the speed of the police car? (speed of sound = 340 m/s)
a. 13.1 m/s
c. 20.0 m/s
b. 17.4 m/s
d. 26.2 m/s
C
You might also like to view...
Mapping the intracluster gas is largely done with red light from the ionized emission lines of hot hydrogen
Indicate whether the statement is true or false
The center of mass and the center of gravity coincide
A) only if the object is symmetrical. B) only if the object is symmetrical and it is in a uniform gravitational field. C) if the object is in a uniform gravitational field. D) at all times.
Doppler Effect: A factory siren indicating the end of a shift has a frequency of 80 Hz where the speed of sound in air is 343 m/s. What frequency is perceived by the occupant of a car that is traveling at 30 m/s (a) towards the factory and (b) away from the factory?
Fill in the blank(s) with the appropriate word(s).
A string 40.0 cm long of mass 8.50 g is fixed at both ends and is under a tension of 425 N
When this string is vibrating in its third OVERTONE, you observe that it causes a nearby pipe, open at both ends, to resonate in its third HARMONIC. The speed of sound in the room is 344 m/s. (a) How long is the pipe? (b) What is the fundamental frequency of the pipe? What will be an ideal response?