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The change in pitch of a train's horn as it passes while you are standing still can be explained by:________ A. Ultrasonic vibrations. B. Sympathetic vibration. C. Resonance. D. The Doppler effect.
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The change in pitch of a train's horn as it passes while you are standing still can be explained by:________

A. Ultrasonic vibrations.
B. Sympathetic vibration.
C. Resonance.
D. The Doppler effect.

User Dmitry Teplyakov
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3.3k points

1 Answer

2 votes
D.the Doppler effect
User Ulla
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3.2k points
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