HESI A2 V1 Exam Questions with Answers (All Correct)
HESI A2 VERSION 1
READING COMPEHENSION
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
behind them, causing the waves to be farther apart and to have a lower frequency. These fastapproaching modes of transportation distance themselves past the listener, who hears a lower
pitch.
Version | latest |
Category | Exam (elaborations) |
Release date | 2021-09-07 |
Latest update | 2021-09-09 |
Pages | 50 |
Language | English |
Comments | 0 |
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