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}