AP Physics B Practice Exam

Category - Introductory Physics

Which of the following observations is a result of the Doppler effect?
  1. Noise from across a lake is louder at night than during the day
  2. A person walking notices that the pitch of a car’s engine decreases as the car passes by.
  3. Beats are produced when two tuning forks with different frequencies are heard together.
  4. A person hears the sound from a radio more clearly in certain areas of a room than in others.
Explanation
Answer: B - A person walking notices that the pitch of a car’s engine decreases as the car passes by.
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