What frequency does the person hear coming from the stationary car?

by garlandcannon

Question by Bill T: What frequency does the person hear coming from the stationary car?

A person is running toward a stationary car at a speed of 6.0 m/s and another car is moving away at a speed
of 25 m/s. The horn in each car is producing a sound with a frequency of 920 Hz.

a) What frequency does the person hear coming from the stationary car?

b) What frequency does the person hear coming from the moving car?

c) What beat frequency does the person hear?

d) The stationary car starts moving towards the person at a speed of 10.0 m/s. What is the
new beat frequency heard by the person?




Best answer:

Answer by Nb
F=the frequency that the person hear.
f=the car stationary frequency

if the person is in front of the stationary car:
F=(V(sound)+v(person)/V(sound)-v(car))f
and if the person is behind the car:
F=(V(sound)-V(person)/V(sound)+v(car))f
Just put the numbers in these formulas

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