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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

Asympathetic vibration.
Bultrasonic vibrations.
Cresonance.
Dthe Doppler effect.

Verified Answer :

AL2006


The change in pitch of a train's horn as it passes while you are
standing still can be described by the Doppler effect, but that
doesn't explain it.

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