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watching
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14 Mar 2020
The Doppler Effect As a train moves upward an observer (see the figure), the pitch of its whistle sounds higher to the observer than it would if the train were at rest, because the crests of the sound waves are compressed closer together. This phenomenon is called the Doppler Effect. The observed pitch 
is a function of the speed 
of the train and is given by
where 
is the actual pitch of the whistle at the source and 
m/s is the speed of sound in the air. Suppose that a train has a whistle pitched at 
Hz. Graph the function 
using a graphing device. How can the vertical asymptote of this function be interpreted physically?
The Doppler Effect As a train moves upward an observer (see the figure), the pitch of its whistle sounds higher to the observer than it would if the train were at rest, because the crests of the sound waves are compressed closer together. This phenomenon is called the Doppler Effect. The observed pitch is a function of the speed of the train and is given by
where is the actual pitch of the whistle at the source and m/s is the speed of sound in the air. Suppose that a train has a whistle pitched at Hz. Graph the function using a graphing device. How can the vertical asymptote of this function be interpreted physically?
Hubert KochLv2
29 May 2020
, then the perceived frequency 
is related to the actual frequency 
as follows.
past a woman standing on the shoulder of a highway, blowing its horn, which has a frequency of 500 Hz. Assume that the speed of sound is 
. (This is the speed in dry air at 
.)
be the amplitude of the sound. Find functions of the form 
that model the perceived sound as the car approaches the woman and as it recedes.