HESI A2 VERSION 1 EXAM 2022 ALL SUBJECTS
COVERED
READING COMPEHENSION
Doppler Effect
Have you ever wondered why the whistle of a traveling, distant
... [Show More] 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 fast- approaching modes of
transportation distance themselves past the listener, who hears a lower pitch.
1. Which statement is not listed as a detail in the passage?
A. The oncoming sound waves have a higher pitch because of high frequency and
closeness of waves.
B. The oncoming sound waves have a higher pitch because of low frequency and
closeness of waves.
C. The whistling sound of the locomotive as it approaches and passes can be
explained by the Doppler effect.
D. The high-pitched sound of the ambulance as it approaches and passes can be
explained by the Doppler effect.
2. What is the main idea of the passage?
A. Trains and ambulances make distinctly loud noises.
B. Low-frequency waves make high-pitched sounds.
C. High-frequency waves make low-pitched sounds.
D. The Doppler Effect explains the rationale for why sound is heard initially more
strongly and then faintly after a moving object has passed.
3. What is the meaning of the word phenomenon in the second paragraph?
A. Something that is lifeless to the senses
B. Something that is nonchalant
C. Something that is significant but unusual
D. Something that is chemical in origin
4. What is the author’s primary purpose in writing this essay?
A. To entertain the reader with information about trains and ambulances
B. To inform the reader about avoiding accidents, which involve trains and
ambulances
C. To inform the reader about how movement affects sound
D. To analyze the difference between train and ambulance sounds
5. Which sound waves have a higher pitch?
A. Those waves that are closer together
B. Those waves that are farther apart
C. Those waves that travel a long distance
D. Those waves that travel a short distance
6. Which sound waves have a lower pitch?
A. Those waves that are closer together
B. Those waves that are farther apart
C. Those waves that travel a long distance
D. Those waves that travel a short distance
Electrocardiogram [Show Less]