Today, many settlers, furnished apartment, forced to perform additional work, including the insulation of their homes, asused standard materials allow only partially hide what is going on in his own house, and not interested in intercourse against the will of their neighbors.
at the speed of sound in solids affects at least the density and elasticity of the material, to stem the tide.Therefore, the equipment space layer adjacent to the retaining wall, do sound insulation with the "overlap" at the top and bottom.It allows to reduce the noise level in decibels, sometimes more than 10 times.Then laid basalt mats, and on top - gypsum boards, which reflect the sound outward from the apartment.When a sound wave "flies" to such a construction, it is attenuated in the insulator layers that are porous and soft.If the sound has a large force, the material absorbs it may even be heated.
Elastic same substance, such as water, wood, metal, good transmit sound vibrations, so we hear the wonderful "singing" of musical instruments.Some nationalities in the past determined the approach, for example, riders, putting his ear to the ground, which is also quite resilient.
speed of sound in km depending on the characteristics of the environment in which it is delivered.In particular, the process may affect its pressure, chemical composition, temperature, elasticity, density and other parameters.For example, the steel sheet passes from the sound wave speed 5100 meters per second, the glass - about 5000 m / s, and granite in the tree - about 4000 m / s.To transfer speed in kilometers per hour must be multiplied figures for 3600 (seconds per hour) and divide by 1000 (meters per kilometer).
speed of sound in km in the aquatic environment is different for substances with different salinity.For fresh water at a temperature of 10 degrees Celsius, it is about 1450 m / s and at a temperature of 20 degrees Celsius and the same pressure - is around 1490 m / s.
Saline same medium is a known higher rate of passage of sound vibrations.
propagation of sound in air is also dependent on temperature.If the value of this parameter is equal to 20 degrees Celsius, the sound waves travel at a speed of 340 m / s, which is about 1200 km / h.And at zero degrees the speed slows down to 332 m / s.Returning to our insulators for the apartments, we can see that this material, like a cork, which is often used to reduce the level of external noise, the sound velocity in kilometers is only 1800 km / h (500 meters per second).This is ten times lower than that in the characteristics of steel parts.
sound wave is a longitudinal oscillation of the environment in which it is distributed.With the passage of, for example, the melody of a musical work through any obstacles, the level of its volume is reduced, becausechanging the amplitude of oscillation.The frequency remains the same, so that we hear the female voice as a female and a male - as a male.The most interesting is the place where the speed of sound in km is close to zero.This - a vacuum in which the waves of this kind almost do not apply.To demonstrate how this works, physics ringing alarm clock placed in a hood, from which air is pumped.The more the air is thin and the quieter heard the call.
