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Unless indicated otherwise, assume the speed of | Ch 16 - 13E

University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman ISBN: 9780321675460 31

Solution for problem 13E Chapter 16

University Physics | 13th Edition

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University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman

University Physics | 13th Edition

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Problem 13E

Unless indicated otherwise, assume the speed of sound in air to be v = 344 m/s. BIO Energy Delivered to the Ear. Sound is detected when a sound wave causes the tympanic membrane (the eardrum) to vibrate. Typically, the diameter of this membrane is about 8.4 mm in humans. (a) How much energy is delivered to the eardrum each second when someone whispers (20 dB) a secret in your ear? (b) To comprehend how sensitive the ear is to very small amounts of energy, calculate how fast a typical 2.0-mg mosquito would have to fly (in mm/s) to have this amount of kinetic energy.

Step-by-Step Solution:

Solution 13E Step 1: Diameter of ear drum d = 8.4 mm Radius r = 4.2 mm or 4.2x10 3 m Sound intensity level = 20dB Problem (a) Step 1: Energy delivered to the ear I = I 010 10 I0 = 10 12 W/m 2 I = 10 12*10 10 = 10 12.102 10 2 I = 10 W/m

Step 2 of 2

Chapter 16, Problem 13E is Solved
Textbook: University Physics
Edition: 13
Author: Hugh D. Young, Roger A. Freedman
ISBN: 9780321675460

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Unless indicated otherwise, assume the speed of | Ch 16 - 13E