Problems
14.1 Speed of Sound, Frequency, and Wavelength
- 1.7 \times 10^6\,\text{m}/\text{s}
- 8.6\times 10^5\,\text{m}/\text{s}
- 1.15\times 10^{-6}\,\text{m/s}
- 3.28\times 10^2\,\text{m}/\text{s}
Medium | v_{w} (m/s) |
Gases at 0 Â°C | |
Air | 331 |
Carbon dioxide | 259 |
Oxygen | 316 |
Helium | 965 |
Hydrogen | 1290 |
Liquids at 20 Â°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 |
- It's wavelength increases by a factor of 4.2.
- It's wavelength increases by a factor of 18.
- It's wavelength decreases by a factor of 4.2.
- 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 15Â° C and having a pressure amplitude of 0.80 Pa. (Hintâ€”Speed of sound in air at 15Â° C is 340 m/s .)
- 9.6Ã—10^{âˆ’3} W / m^{2}
- 7.7Ã—10^{âˆ’3} W / m^{2}
- 9.6Ã—10^{âˆ’4} W / m^{2}
- 7.7Ã—10^{âˆ’4} W / m^{2}
- 4.3\,\text{Pa}
- 0.20\,\text{Pa}
- 0.04\,\text{Pa}
- 2.1\,\text{Pa}
14.3 Doppler Effect and Sonic Booms
- 17.07\,\text{m}/\text{s}
- 16.55\,\text{m}/\text{s}
- 14.59\,\text{m}/\text{s}
- 13.1\,\text{m/s}
- 47.0\,\text{Hz}
- 43.0\,\text{Hz}
- 94.9\,\text{Hz}
- 90.0\,\text{Hz}
14.4 Sound Interference and Resonance
- 165.1\,\text{cm}
- 82.22\,\text{cm}
- 20.25\,\text{cm}
- 41.38\,\text{cm}
- 77.32\,\text{cm}
- 44.09\,\text{cm}
- 32.16\,\text{cm}
- 11.03\,\text{cm}