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AP Physics 2
14.5 The Doppler Effect
BeginnerMCQMathematicalConceptual17.2k
A horizontal line represents the ground. On the far left, a stick figure is labeled Observer 2. On the far right, a stick figure is labeled Observer 1. In the middle, a circular sound source has a horizontal arrow pointing to the right labeled v_s. No wave fronts, sound wave arcs, or other lines appear. No additional labels appear.
A moving sound source between two stationary observers.
A sound source emitting a wave of constant frequency \(f_0\) moves at a constant speed to the right along a straight line between two stationary observers. Observer 1 is located to the right of the source (ahead of its motion), and Observer 2 is located to the left of the source (behind its motion). Which of the following correctly compares the frequencies \(f_1\) and \(f_2\) detected by Observers 1 and 2 to \(f_0\), and provides the correct explanation?

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