College Physics
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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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 vib…
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 th…
Question

1a. A speaker is playing music at 4.3 W. What is the intensity of the music if the speaker is 0.5 m away from you?

 

 

 

 

 

 

 

 

 

 

1b. What is the loudness of this speaker?

 

 

 

 

 

 

 

 

 

  1. Speaker A is playing a sound with double the intensity of Speaker B. How much louder is Speaker A than Speaker B?

 

 

 

 

 

 

 

  1. Speaker A is playing a sound with a quarter of the amplitude of Speaker B. How much louder is Speaker A than Speaker B?

 

 

 

 

  1. What is the impedance of a wave with a speed of 243m/s and a density of 3.2 kg/m3.

 

 

 

 

 

 

 

 

  1. What is the ratio of impedance when Z1 = 3.2 x 103 and Z2 = 1.45 x 102 ?

 

 

 

 

 

 

 

 

 

 

7a. The ratio of impedance of two substances is 7. What percentage of intensity is transmitted at the boundary?

 

 

 

 

 

 

 

 

 

 

 

 

7b. What percentage of intensity is reflected?

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