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.
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.
I was born in a small town in upstate New York and discovered my calling to nursing at a young age. Raised in a close-knit family, I was instilled with values of compassion, empathy, and service to others from a tender age.
After graduating high school with honors, I enrolled in the esteemed CHAMBERLAIN Nursing College, where I excelled both academically and in clinical practice. My professors recognized my innate ability to connect with patients, offering comfort and reassurance during their most vulnerable moments.
Upon graduating with a Bachelor of Science in Nursing, I wasted no time in immersing myself in the world of healthcare. My first position was in the bustling emergency room of Mercy General Hospital, where I quickly gained a reputation for my calm demeanor under pressure and my exceptional critical thinking skills.
My career took an unexpected turn when I joined a medical mission to a remote village in Guatemala. The experience proved transformative, solidifying her commitment to providing healthcare to underserved communities. I returned with a renewed sense of purpose, eager to make a difference on a global scale.
Over the years, I have pursued further education and training, earning certifications in trauma nursing and public health.
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Bespaart héél veel opzoekwerk en stress ook zeer overzichtelijk en gebruiksvriendelijk.
Zeer goed in gebruik en betrouwbaar. Zelf zou ik er ook samenvattingen op plaatsen.
Zeker de moeite als je een groot vak op het nippertje niet helemaal rond zou krijgen.
Prima website waar veel kennis te vinden is. De website heb ik gevonden door te zoeken naar samenvattingen.
Aan te raden! Goedkoop en snel! Het aanbod is heel goed en je kan je favoriete personen volgen.
Fijne website voor elke student die hulp nodig heeft bij het leren.
Ik verkoop samenvattingen om andere studenten te helpen en tegelijk wat bij te verdienen.
Het is heel fijn om via Knoowy extra ondersteuning te hebben bij het studeren door middel van samenvattingen van de lesstof.