The Doppler Effect As a train moves toward 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 closer together. 'This phenomenon is called the Doppler effect. The observed pitch P is a function of the speed v of the train and is given by
where PO is the actual pitch of the whistle at the source and
So = 332 rn/s is the speed of sound in air. Suppose that a train has a whistle pitched at Po = 440 Hz. the function y = P(v) using a graphing device. How can the vertical asymptote of this function be interpreted physically?
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Chapter 3 Solutions
College Algebra
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