which sound waves have a higher pitch

HESI A2

HESI A2 Reading Comprehension V1 2024

1. 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

Correct answer: A

Rationale: Sound waves that are closer together have a higher pitch. This is explained by the Doppler Effect, where as a source of sound moves closer to an observer, the waves are compressed, resulting in a higher frequency and a higher pitch. Conversely, when the source moves away, the waves are stretched, leading to a lower frequency and a lower pitch. Therefore, choice A is correct. Choices B, C, and D are incorrect as they do not accurately describe the relationship between sound wave frequency and pitch.

2. What would be the best title for this passage?

A. Being a Team in PE
B. A New Kind of Grade
C. Learning Martial Arts
D. PE for School and Life

Correct answer: D

Rationale: The best title for this passage is 'PE for School and Life' as it encapsulates the broader purpose of physical education described in the extract. The passage emphasizes teaching students lifelong fitness habits, instilling lessons about maintaining good health, staying fit, and introducing exercise that can be incorporated into their lives. The focus is on fitness as a lifelong skill rather than just a short-term activity for a good grade. Choice A, 'Being a Team in PE,' is incorrect as the passage highlights individual exercise and movement rather than team-based activities. Choice B, 'A New Kind of Grade,' is also incorrect as the passage mentions a shift in grading towards effort rather than specific performance tasks. Choice C, 'Learning Martial Arts,' is too narrow as the passage discusses a variety of activities beyond martial arts that are taught in modern PE classes.

3. 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.

Correct answer: C

Rationale: The correct summary of the passage is option C. The passage explains how the ECG systematically measures and records the 'wave of excitation' that occurs within the heart in three distinct steps, spreading from the SA node to the AV node. This summary effectively captures the main focus of the passage. Option A is incorrect because it only mentions the detection of electric currents in the body and recognizing abnormalities by medical staff, missing the key information about the 'wave of excitation' and its stages. Option B is incorrect as it focuses solely on the measurement and recording of unique electric currents on the body's surface, neglecting the specific process described in the passage. Option D is also incorrect as it provides a general description of how the ECG measures electric currents without emphasizing the specific stages of the 'wave of excitation' as detailed in the passage.