HESI A2 READING COMPEHENSION Doppler Effect

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HESI A2 READING COMPEHENSION Doppler Effect. 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-fre... quency 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. 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 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 What is the best summary of the passage? A. Electric currents within the body are due to electrostatic charges set off by the heart. Medical staff are trained to recognize any abnormalities within the heart. B. Every individual has unique electric currents on the surface of the body. The ECG measures and records these electric currents. C. The ECG systematically and rather quickly measures the stages at which the “wave of excitation” occurs within the heart and records them. This wave has three distinct steps that spread from the SA node to the AV node. D. The ECG measures the electric currents within the body. These currents are detected on the surface of the body when the body is connected to an amplifier. [Show More]

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