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Giancoli 7th Edition textbook cover
Giancoli's Physics: Principles with Applications, 7th Edition
12
Sound
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12-1: Characteristics of Sound
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12-2: Intensity of Sound; Decibels
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12-3: Loudness
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12-4: Sources of Sound: Strings and Air Columns
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12-5: Quality of Sound, Superposition
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12-6: Interference; Beats
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12-7: Doppler Effect
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12-8: Shock Waves; Sonic Booms
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Question by Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014, Reprinted by permission of Pearson Education Inc., New York.
Problem 46
Q

A piano tuner hears one beat every 2.0 s when trying to adjust two strings, one of which is sounding 350 Hz. How far off in frequency is the other string?

A
±0.5 Hz\pm 0.5 \textrm{ Hz}
Giancoli 7th Edition, Chapter 12, Problem 46 solution video poster
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VIDEO TRANSCRIPT

This is Giancoli Answers with Mr. Dychko. The beat frequency that the piano tuner hears is the absolute value of the difference in the frequencies. And it's absolute value because it's not clear whether frequency 2 is higher or lower. The beat frequency doesn't tell you. So, the beat frequency is going to be 1 cycle for every 2 seconds that they're hearing which is going to be plus or minus 0.5 hertz.

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Giancoli Answers, including solutions and videos, is copyright © 2009-2024 Shaun Dychko, Vancouver, BC, Canada. Giancoli Answers is not affiliated with the textbook publisher. Book covers, titles, and author names appear for reference purposes only and are the property of their respective owners. Giancoli Answers is your best source for the 7th and 6th edition Giancoli physics solutions.