AP Physics B Practice Exam

Category - Introductory Physics

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Which of the following observations is a result of the Doppler effect?

Noise from across a lake is louder at night than during the day
A person walking notices that the pitch of a car’s engine decreases as the car passes by.
Beats are produced when two tuning forks with different frequencies are heard together.
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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