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Because of the Doppler effect, the sound of the engines of an aircraft that flies over us
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Because of the Doppler effect, the sound of the engines of an aircraft that flies over us

User Ingen
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1 Answer

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... seems to have a slightly higher pitch as it approaches us,
then seems to have a slightly lower pitch after it passes overhead
and flies away from us.

The higher the aircraft is over us, the smaller the effect is.
User Lesnar
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