Sound grows more faint as you move away from the source for two reasons: attenuation and diffusion. Sound energy attenuates as it passes through a medium, until eventually all the sound energy is lost to friction. So the further away you are from the source, the more the sound has attenuated before reaching you.
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Diffusion occurs because the sound wave expands in all directions. Assuming no attenuation, the amount of acoustic energy striking any given surface area (your ear drum, for example) is inversely proportional to the square of the distance to the source, so as you move away from the sound, the amount of acoustic energy declines exponentially.
They spread out, reducing the energy per unit of surface.
Sound travels in all directions. it will spread out.
There energy decreases
When a sound-source moves toward you, its pitch gets higher and the sound gets louder. When it moves away, the pitch lowers and it gets quieter. The frequency change is called the Doppler shift.
Sound waves move away from the source of energy, but other sorts of waves move perpendicular (at a right angle) to the energy source
They spread out, reducing the energy per unit of surface.
Echoes get fainter because each time the sound wave reflects off a surface, it loses some energy due to absorption, scattering, and dispersion. This energy loss causes the echo to decrease in intensity as it repeatedly bounces off surfaces and travels further away from the source.
Build a wall around the noise source. Go far away from the sound source. Measure the sound pressure level at the distance where your ear is and learn about the inverse distance law 1/r. Scroll down to related links and look at "The inverse distance law 1/r".
Louder or fainter means more intense or less intense of sound vibrations respectively.Intensity in turn is the energy per unit area.Imagine the source of sound to be at the centre of a sphere. When you are far away then the radius of the sphere would be larger and thus the surface area of the sphere also becomes larger.As the energy given out by the source of sound is divided by larger area to get the intensity its value becomes lesser. Hence fainter.Ear drums and microphone diaphragms are moved by sound pressure.Note: Sound power (sound intensity) is the cause - and the sound pressure is the effect. The effect is of particular interest to the sound engineer.Another Perspective:The intensity (loudness) of sound decreases with the square of the distance from the source.
Build a wall around the noise source. Go far away from the sound source. Install accoustic insulation. Learn to use the inverse distance law 1/r. Scroll down to related links and look at "The inverse distance law 1/r".
The source that emitted the sound wave.
Sound travels in all directions. it will spread out.
They get distant and more quieter
A sound wave is a transfer of energy as it travels away from a vibrating source.
The loudest noise or sound is The Bloop because in 1997, U.S. NOAA heard a sound that is never been heard of that is also the loudest sound ever. The sound can cause from more than 5,000 km away from it's source. If it is an animal, it is louder and bigger than the loudest animal and the biggest animal in Earth.
There energy decreases
When a sound-source moves toward you, its pitch gets higher and the sound gets louder. When it moves away, the pitch lowers and it gets quieter. The frequency change is called the Doppler shift.