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According to the Doppler effect, the sound of a police car siren is______ (A. Quieter B. Louder) and______ (A. Higher B. Lower) pitched as it approaches the observer.
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According to the Doppler effect, the sound of a police car siren is______ (A. Quieter B. Louder) and______ (A. Higher B. Lower) pitched as it approaches the observer.

User Sherlin
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The best answer i can get give u is B i hope this helps
User Christophe Biocca
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It would B and A hope this helps



User LexJacobs
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