![]() Because S-waves do not pass through the liquid core, two shadow regions are produced ( (Figure)). The time between the P- and S-waves is routinely used to determine the distance to their source, the epicenter of the earthquake. The P-wave gets progressively farther ahead of the S-wave as they travel through Earth’s crust. P-waves have speeds of 4 to 7 km/s, and S-waves range in speed from 2 to 5 km/s, both being faster in more rigid material. Both types of earthquake waves travel slower in less rigid material, such as sediments. For that reason, the speed of longitudinal or pressure waves (P-waves) in earthquakes in granite is significantly higher than the speed of transverse or shear waves (S-waves). The bulk modulus of granite is greater than its shear modulus. The speed of sound at 30,000ft on a 'Standard Day' (-44.4 degrees C) is about 678mph. Earthquakes produce both longitudinal and transverse waves, and these travel at different speeds. The speed of sound at sea level on a 'Standard Day' (15 degrees C) is about 761mph or 1225kph. Seismic waves, which are essentially sound waves in Earth’s crust produced by earthquakes, are an interesting example of how the speed of sound depends on the rigidity of the medium. The second shell is farther away, so the light arrives at your eyes noticeably sooner than the sound wave arrives at your ears.Īlthough sound waves in a fluid are longitudinal, sound waves in a solid travel both as longitudinal waves and transverse waves. The first shell is probably very close by, so the speed difference is not noticeable. Sound and light both travel at definite speeds, and the speed of sound is slower than the speed of light. It is not dependent upon the sound amplitude, frequency or wavelength.V=\sqrt Differentiating with respect to the density, the equation becomes rho is the density &rho and p is the sound pressure.Notice: The speed of sound is alike on a mountain top as well as at sea level with the same air temperature.Google is not correct (look at the following link): is the answer of Google: "Speed of sound at sea level = 340.29 m/s".This is no good answer, because they forgot to tell us the temperature,and the atmospheric pressure "at sea level" has no sense.The speed of sound in air is determined by the air itself. Just from this data, you can see that Felix Baumgartner did. If you move up to 120,000 feet, the speed will drop down to around 200 m/s. The wavelength of a sound is the distance between adjacent identical parts of a wavefor example, between adjacent compressions as illustrated in Figure 2. ![]() ![]() The air pressureand the density of air (air density) are proportional to each other at the same temperature.It applies always p / &rho = constant. At sea level, the value is right around the 340 m/s mark. For typical air at room conditions, the average molecule is moving at about 500 m/s (close to 1000 miles per hour). The relationship of the speed of sound, its frequency, and wavelength is the same as for all waves: vw f, where vw is the speed of sound, f is its frequency, and is its wavelength. Other speeds, such as those presented below, use values other than those relating to a "standard atmospheric day." They are not incorrect, they are simply based on values other than a "standard atmospheric day."The speed of sound is 343 m/s or 1126.547 ft/s (768.095 mph) at a temperature of 20☌ or 68☏.The speed of sound has nothing to do with the atmospheric pressure at sea level, but the temperature is very important.Scroll down to related links and read the short article "Speed of sound - temperature matters, not air pressure".The air pressure and the air density are proportional to each other at the same temperature.The speed of sound c depends on the temperature of air and not on the air pressure!The humidity of air has some negligible effect on the speed of sound. At standard day values, the speed of sound is 761 mph. The speed of sound is normally calculated using the values of a "standard atmospheric day." A "standard atmospheric day" refers to a sea level pressure of 29.92 in-Hg (1013.2 mb) and a temperature of 15☌ (59☏).
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