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when an ambulance drives by your house with sirens blaring, the sound waves of the sirens are (space) as it approaches and (space) as it sppeds away
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when an ambulance drives by your house with sirens blaring, the sound waves of the sirens are (space) as it approaches and (space) as it sppeds away

User Sultan Ali
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The sound waves are closer together as the ambulance approaches and farther apart as it speeds away.

This is because of the doplar effect.
User Mahe
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