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Get Full Access to University Physics - 13 Edition - Chapter 15 - Problem 1e
Get Full Access to University Physics - 13 Edition - Chapter 15 - Problem 1e

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# The speed of sound in air at 20o C is 344 m/s. (a) What is ISBN: 9780321675460 31

## Solution for problem 1E Chapter 15

University Physics | 13th Edition

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Problem 1E

The speed of sound in air at 20o C is 344 m/s. (a) What is the wavelength of a sound wave with a frequency of 784 Hz, corresponding to the note G5 on a piano, and how many milliseconds does each vibration take? (b) What is the wavelength of a sound wave one octave higher (twice the frequency) than the note in part (a)?

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9/7/2016 3.3 Hearing What do we hear  Sound waves: vibrations of air o Just like we don’t see all the possible wavelengths of light out there, we also don’t hear all the frequencies of possible sound waves. o We hear between 20­20,000 Hz (cycles per second) Features of sound 1. Pitch (low, high, medium tone) o Corresponds to frequency o Long wavelength, low frequency o Short wavelength, high frequency 2. Loudness (how loud is it) o Corresponds to amplitude 3. Timbre (what is the quality of the sound) o Corresponds to the purity of the wavelengths (how many different frequencies are there Similar to light) Light Sound Wavelength Hue (color) Pitch Amplitude Brightness Loudness Purity Saturation Timbre  We measure in decibels (dB). o Ex: Absolute threshold (0), Whispering (20dB), Rainfall (50dB), Normal conversation (60dB), Hair dryer (70dB) o Ex: Average city traffic (80dB), Motorcycle that is 25 feet away (88dB), MP3 Player at max volume (105dB), Snowmobile (105dB) o Ex: Jet engine (140dB) o Continual exposure may cause damage (>80dB) o Hearing becomes painful (> 125dB) Ear Transforming Sound Waves into the Language of the Brain Ears transduce the physical motion of sound waves into the electrical and chemical signals of the nervou

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