The speed of sound in air is determined by the air itself. 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. To determine the speed and distance traveled of micro-bubble bursts in. The temperature of sea water is assumed to be 4 degrees C in the depth of 1000m, and 2 degrees in the depth of 3000m or more. It is calculated by the Del Grosso or UNESCO formula.
rho is the density Ï 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. The Velocity of sound in sea-water changes with water pressure, temperature, and salinity. The air pressureand the density of air (air density) are proportional to each other at the same temperature.It applies always p / Ï = constant. 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. The air pressure and the air density are proportional to each other at the same temperature. The temperature is important not the air pressure. If the actual temperature is higher, then the speed of sound will be higher as well. This will give you more accurate results. The standard atmospheric model tells us that the speed of sound, or Mach 1, at sea level is: 1,116.4 ft/s 340.3 m/s 761.2 mph 1,225.1 km/h 661.5 knots However, this model assumes a 'standard day' in which the air temperature is 59☏ (15☌). Because S-waves do not pass through the liquid core, two shadow regions are produced ( (Figure)).The accepted value of speed of sound in air is determined by the equation vT= (331.5 + 0.607T) m/s for the value T, put the temperature in. 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. For typical air at room conditions, the average molecule is moving at about 500 m/s (close to 1000 miles per hour). 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. At 0 ☌ (32 ☏), the speed of sound is about 331 m. At 20 ☌ (68 ☏), the speed of sound in air is about 343 metres per second (1,125 ft/s 1,235 km/h 767 mph 667 kn), or one kilometre in 2.9 s or one mile in 4.7 s. 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). But now we know that the speed of sound depends on the temperature and the medium through which a sound wave is propagating. The bulk modulus of granite is greater than its shear modulus. Earthquakes produce both longitudinal and transverse waves, and these travel at different speeds. 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 speed has a weak dependence on frequency and pressure in ordinary air, deviating slightly from ideal behavior. The speed of sound in an ideal gas depends only on its temperature and composition. 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. At 0 C (32 F), the speed of sound in air is about 331 m/s (1,086 ft/s 1,192 km/h 740 mph 643 kn). 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. V=\sqrt Differentiating with respect to the density, the equation becomes
0 kommentar(er)
