#每日新知 2024 - 01 - 25(025/365) D2175
图1 楚庄王的演讲 图2 很有意思的思路
『为什么下雪后会变得安静?当新鲜的雪覆盖地面时,户外往往会变得明显安静,这归因于雪的独特特性。根据肯塔基大学的声学专家大卫·赫林的说法,雪的声音吸收能力在 0 到 1 的范围内可以测量为 0.5 到 0.9,吸收能力越高,周围环境就越安静。仅仅几英寸的降雪——有时甚至只有一英寸——就可以显著减少环境噪音,尤其是高频声音。/Why Does It Get Quiet After Snowfall? When fresh snow blankets the ground, the outdoors often becomes noticeably quieter due to the unique properties of snow. According to David Herrin, an acoustics expert at the University of Kentucky, snow’s sound absorption can measure between 0.5 to 0.9 on a scale of 0 to 1, with higher absorption resulting in quieter surroundings. Just a couple of inches of snowfall—sometimes even a single inch—can significantly reduce ambient noise, especially for higher-frequency sounds./』——Beyond Euclid - #161 - Snowflakes
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