Standing on the sidewalk, you listen to the horn of a passing car. As the car passes, the frequency of the sound changes from high to low in a continuous manner; that is,
there is no abrupt change in the perceived frequency. This occurs because
a) the pitch of the sound of the horn changes continuously.
b) the intensity of the observed sound changes continuously.
c) you are not standing directly in the path of the moving car
d) of all of the above reasons.
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