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What causes the increase in pitch as an ambulance siren moves toward you? the sound waves become compressed. the amplitude of the sound waves changes. the sound waves spread far…

What causes the increase in pitch as an ambulance siren moves toward you? the sound waves become compressed. the amplitude of the sound waves changes. the sound waves spread far…
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What causes the increase in pitch as an ambulance siren moves toward you? the sound waves become compressed. the amplitude of the sound waves changes. the sound waves spread farther apart. the speed of the sound waves changes?

User Ali Zarezade
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1 Answer

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This is due to the Doppler effect. The position you are in regard to the sound wave causes a change in the amplitude which affects frequency and moves the pitch up
User Talouv
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