Question

QUESTION 10 A truck moving at 30 m/s passes a police car moving at 40 m/s in the opposite direction. If the frequency of the siren is 500 Hz relative to the police car, what is the change in frequency (in Hz) heard by an observer in the truck as the two vehicles pass each other? (The speed of sound in air is 343 m/s.) a. 207 b. 136 c. 238 d. 234 e. 342

          QUESTION 10
A truck moving at 30 m/s passes a police car moving at 40 m/s in the opposite direction. If the frequency of the siren is 500 Hz
relative to the police car, what is the change in frequency (in Hz) heard by an observer in the truck as the two vehicles pass each
other? (The speed of sound in air is 343 m/s.)
a. 207
b. 136
c. 238
d. 234
e. 342

QUESTION 10
A truck moving at 30 m/s passes a police car moving at 40 m/s in the opposite direction. If the frequency of the siren is 500 Hz
relative to the police car, what is the change in frequency (in Hz) heard by an observer in the truck as the two vehicles pass each
other? (The speed of sound in air is 343 m/s.)
a. 207
b. 136
c. 238
d. 234
e. 342

Added by -Ngel S.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Kirsty Gledhill

Step 1

The relative velocity is the sum of their individual velocities, taking into account their opposite directions. Relative velocity = velocity of truck + velocity of police car Relative velocity = 30 m/s + (-40 m/s) = -10 m/s Note: The negative sign indicates that Show more…

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QUESTION 10: A truck moving at 30 m/s passes a police car moving at 40 m/s in the opposite direction. If the frequency of the siren is 500 Hz relative to the police car, what is the change in frequency in Hz heard by an observer in the truck as the two vehicles pass each other? (The speed of sound in air is 343 m/s.) a. 207 b. 136 c. 238 d. 234 e. 342