HESI A2 VERSION 1 READING COMPEHENSION Doppler Effect
Chamberlain College Of Nursing
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Hesi A2 Version 1 Reading Compehension Doppler Effect
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 Do...