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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

Aresonance.
Bthe Doppler effect.
Csympathetic vibration.
Dultrasonic vibrations.

Verified Answer :

olemakpadu
Bthe Doppler effect.

The Doppler effect is a phenomenon whereby the frequency from a moving object towards an observer appears to increase while the frequency appears to decrease as it moves away from the observer.

virgostarmania

B you saayyyyyy? HMMMMMM CORRECT !!!

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