A physics class is experimenting with sound waves in the hallway of their school. Student A is holding his physics textbook out in front of him at one end of the hallway. At the other end of the hallway, 100 m away, two students (student B and student C) are listening for the sound of the textbook hitting the floor, ready to raise a hand as soon as they hear the sound. Student B is standing up, while student C is laying down with her ear pressed against the floor. When student A drops the textbook, student C is the first to raise her hand. Explain why student C hears the sound before student B. (DOK 2 A. Student C has her ear pressed against the solid floor, and sound travels faster in solids than in gases (like air) O B. Student C was laying on the ground, and sound travels faster through lower air near the floor OC. The speed of sound is constant, so student C just raised her hand faster O D. Student C has her ear pressed against the cold floor, sound travels faster at cold temperatures

A physics class is experimenting with sound waves in the hallway of their school. Student A is holding his physics textbook out in front of him at one end of the hallway. At the other end of the hallway, 100 m away, two students (student B and student C) are listening for the sound of the textbook hitting the floor, ready to raise a hand as soon as they hear the sound. Student B is standing up, while student C is laying down with her ear pressed against the floor. When student A drops the textbook, student C is the first to raise her hand. Explain why student C hears the sound before student B. (DOK 2 A. Student C has her ear pressed against the solid floor, and sound travels faster in solids than in gases (like air) O B. Student C was laying on the ground, and sound travels faster through lower air near the floor OC. The speed of sound is constant, so student C just raised her hand faster O D. Student C has her ear pressed against the cold floor, sound travels faster at cold temperatures

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Properties of sound

A sound wave is a mechanical wave (or mechanical vibration) that transit through media such as gas (air), liquid (water), and solid (wood).

Quality Of Sound

A sound or a sound wave is defined as the energy produced due to the vibrations of particles in a medium. When any medium produces a disturbance or vibrations, it causes a movement in the air particles which produces sound waves. Molecules in the air vibrate about a certain average position and create compressions and rarefactions. This is called pitch which is defined as the frequency of sound. The frequency is defined as the number of oscillations in pressure per second.

Categories of Sound Wave

People perceive sound in different ways, like a medico student takes sound as vibration produced by objects reaching the human eardrum. A physicist perceives sound as vibration produced by an object, which produces disturbances in nearby air molecules that travel further. Both of them describe it as vibration generated by an object, the difference is one talks about how it is received and other deals with how it travels and propagates across various mediums.

Question

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A physics class is experimenting with sound waves in the hallway of their school. Student A is holding his physics textbook out in front of him at one end of the
hallway. At the other end of the hallway, 100 m away, two students (student B and student C) are listening for the sound of the textbook hitting the floor, ready to
raise a hand as soon as they hear the sound. Student B is standing up, while student C is laying down with her ear pressed against the floor. When student A
drops the textbook, student C is the first to raise her hand. Explain why student C hears the sound before student B. (DOK 2
O A. Student C has her ear pressed against the solid floor, and sound travels faster in solids than in gases (like air)
O B. Student C was laying on the ground, and sound travels faster through lower air near the floor
C. The speed of sound is constant, so student C just raised her hand faster
O D. Student C has her ear pressed against the cold floor, sound travels faster at cold temperatures

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