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HESI A2 VERSION 1 - Latest 2021/2022 Chamberlain College

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HESI A2 VERSION 1 READING COMPEHENSION Doppler Effect Have you ever wondered why the whistle of a traveling, distant locomotive predicts its approach several yards before anyone actually sees it? ... Or why an oncoming ambulance’s screaming siren is heard momentarily several feet before the ambulance comes into full view, before it passes you, and why its siren is still heard faintly well after the ambulance is out of sight? What you are witnessing is a scientific phenomenon known as the Doppler Effect. What takes place is truly remarkable. In both of these instances, when the train or ambulance moves toward the sound waves in front of it, the sound waves are pulled closer together and have a higher frequency. In either instance, the listener positioned in front of the moving object hears a higher pitch. The ambulance and locomotive are progressively moving away from the sound waves [Show More]

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