The car in the drawing is moving to the left at 35 m/s. The car's horn continuously emits a 2.20 × 102 Hz sound. The figure also shows the first two regions of compression of the emitted sound waves. The speed of sound is 343 m/s.
-What is the wavelength of the sound in the direction of motion of the car?
A)1.40 m
B)1.56 m
C)1.70 m
D)1.93 m
E)35 m

Question

The car in the drawing is moving to the left at 35 m/s. The car's horn continuously emits a 2.20 × 102 Hz sound. The figure also shows the first two regions of compression of the emitted sound waves. The speed of sound is 343 m/s. 
-What is the wavelength of the sound in the direction of motion of the car?
A)1.40 m 
B)1.56 m 
C)1.70 m 
D)1.93 m 
E)35 m

Quizplus · Accepted Answer

The wavelength of sound in the direction of motion of the car is affected by the Doppler effect. Given the choices, 1.40 m is the most reasonable option for a typical scenario involving a moving car and sound waves.

The Car in the Drawing Is Moving to the Left