| Added | Thu, 16/02/2017 |
| Источники | |
| Дата публикации | Thu, 16/02/2017
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When the Blizzard subsides, leaving a white landscape on the street is noticeably quieter. And there's a scientific explanation. The fact that the snow plays a huge role in how sound travels.
When light fluffy snow accumulates on the ground, it acts as a sound-absorbing material. "The snow immediately after a snowfall is porous, and is usually a porous materials, such as fiber and foam absorb sound," says David Herrin University of Kentucky (USA).
Usually for good sound absorption is required required 5 cm of snow, but even 2.5 cm can absorb sound, especially if he has a high frequency. The absorption is measured on a scale from 0 to 1. The ability of snow to absorb the sound — to 0.5–0.9.
However, if the structure of snow changes, the amount of noise in the environment increases. When the top layer of snow melts and freezes again, it becomes solid and reflects sound waves, causing sounds to travel further and become clearer.
Translated by «Yandex.Translator»
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