Problem C8:
A car is driving with a speed of v/n_{2}, where v is the speed
of sound in air. If n_{2} is positive, the car is driving
towards you, and if n_{2} is negative the car is driving away
from you. You are standing on the ground. The driver honks the car's horn, which has a frequency of
n_{1} Hz. See the figure below. What is the frequency of the horn's sound
that you hear? If you hear a frequency of n_{3} Hz,
what is n_{3}? Note that n_{1} and n_{3} have units of
Hz, and n_{2} is unitless.

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