17 A fire engine sounds its siren as it approaches you. Rank the following Doppler effect
frequencies from highest to lowest.
a. The speed of the fire engine is 25 mph while you are stationary.
b. The speed of the fire engine is 25 mph while you drive away from it at 35 mph.
c. The speed of the fire engine is 25 mph while you drive toward it at 35 mph.