Problems
14.1 Speed of Sound, Frequency, and Wavelength
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1.7 \times 10^6\,\text{m}/\text{s}
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8.6\times 10^5\,\text{m}/\text{s}
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1.15\times 10^{-6}\,\text{m/s}
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3.28\times 10^2\,\text{m}/\text{s}
Medium | vw (m/s) |
Gases at 0 °C | |
Air | 331 |
Carbon dioxide | 259 |
Oxygen | 316 |
Helium | 965 |
Hydrogen | 1290 |
Liquids at 20 °C | |
Ethanol | 1160 |
Mercury | 1450 |
Water, fresh | 1480 |
Sea water | 1540 |
Human tissue | 1540 |
Solids (longitudinal or bulk) | |
Vulcanized rubber | 54 |
Polyethylene | 920 |
Marble | 3810 |
Glass, Pyrex | 5640 |
Lead | 1960 |
Aluminum | 5120 |
Steel | 5960 |
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It's wavelength increases by a factor of 4.2.
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It's wavelength increases by a factor of 18.
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It's wavelength decreases by a factor of 4.2.
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It's wavelength decreases by a factor of 18.
14.2 Sound Intensity and Sound Level
Calculate the sound intensity for a sound wave traveling through air at 15° C and having a pressure amplitude of 0.80 Pa. (Hint—Speed of sound in air at 15° C is 340 m/s .)
- 9.6×10−3 W / m2
- 7.7×10−3 W / m2
- 9.6×10−4 W / m2
- 7.7×10−4 W / m2
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4.3\,\text{Pa}
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0.20\,\text{Pa}
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0.04\,\text{Pa}
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2.1\,\text{Pa}
14.3 Doppler Effect and Sonic Booms

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17.07\,\text{m}/\text{s}
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16.55\,\text{m}/\text{s}
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14.59\,\text{m}/\text{s}
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13.1\,\text{m/s}

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47.0\,\text{Hz}
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43.0\,\text{Hz}
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94.9\,\text{Hz}
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90.0\,\text{Hz}
14.4 Sound Interference and Resonance
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165.1\,\text{cm}
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82.22\,\text{cm}
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20.25\,\text{cm}
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41.38\,\text{cm}
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77.32\,\text{cm}
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44.09\,\text{cm}
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32.16\,\text{cm}
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11.03\,\text{cm}