The Doppler effect (sound)
Set the source frequency and speed to hear, in numbers, the higher pitch as it approaches and the lower pitch as it leaves.
Works in metric or imperial units.
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Questions students ask
How does the Doppler effect show the universe is expanding?
Light from distant galaxies is shifted towards red (longer wavelengths), meaning they are moving away; further galaxies are moving faster.
What formula does it use?
f = f₀ × v/(v ∓ vₛ): minus when the source approaches, plus when it moves away.
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