Giancoli's Physics: Principles with Applications, 7th Edition
12
Sound
Change chapter12-1: Characteristics of Sound
12-2: Intensity of Sound; Decibels
12-3: Loudness
12-4: Sources of Sound: Strings and Air Columns
12-5: Quality of Sound, Superposition
12-6: Interference; Beats
12-7: Doppler Effect
12-8: Shock Waves; Sonic Booms
Question by Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014, Reprinted by permission of Pearson Education Inc., New York.
Problem 22
Q
A 5000-Hz tone must have what sound level to seem as loud as a 100-Hz tone that has a 50-dB sound level? (See Fig. 12–6.)
Figure 12-6 Sensitivity of the human ear as a function of frequency (see text). Note that the frequency scale is “logarithmic” in order to cover a wide range of frequencies.
A
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VIDEO TRANSCRIPT
This is Giancoli Answers with Mr. Dychko. So, our job here is to figure out which redline to follow because any sound along a single redline, all has the same perceived loudness level. And so when we look at the 100 hertz tone with a 50 decibel sound level, it lands on the red line labeled 20 phons. And so we follow that same red line to 5,000 hertz and the sound level is about 20 decibels and so there's our answer, the same perceived loudness level as the 100 hertz tone with 50 decibels will be at 5,000 hertz with only 20 decibels.
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