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A train whistle is at a higher pitch (note) as it approaches you and then drops to a lower pitch as it moves away. This effect is called?

A train whistle is at a higher pitch (note) as it approaches you and then drops to a lower pitch as it moves away. This effect is called?
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A train whistle is at a higher pitch (note) as it approaches you and then drops to a lower pitch as it moves away. This effect is called?

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User Udi Dahan
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2 Answers

4 votes
The effect being mentioned is called "The doppler effect".
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User Benjifisher
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7 votes
the effect is called The doppler effect
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User Metaphysiker
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