Problem

A driver sits in her car at a railroad crossing. Three trains go by at different (constant...

A driver sits in her car at a railroad crossing. Three trains go by at different (constant) speeds, each emitting the same sound. Bored, the driver makes a recording of the sounds. Later, at home, she plots the frequency as a function of time on her computer, resulting in the plots shown in the figure. Which of the three trains had the highest speed?

a) the one represented by the solid line

b) the one represented r by the dashed line

c) the one represented by the dotted line

d) impossible to tell

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Solutions For Problems in Chapter 16

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