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Muffled Snow cover reduces the energy and volume of sound. Tiny air pockets in the snowpack absorb the sound waves, especially higher frequencies. V Sound reflects off hard surfaces, producing louder volume and echoes. Reflection Explosion CONCRETE Sound is absorbed by the air pockets between the snow flakes Darker areas are trapped air in the snow pack SNOW Highs and lows Pressure Snow reduces the energy or pressure in air created by a sound wave. The pressure created by the peak of a sound wave at about 100 feet is 66 percent less intense over snow compared to grass. Intensity Snow is particularly good at absorbing high-pitch, high- frequency sound. Low bass tones, measured at 50 hertz or lower, travel as far over snow as they do over grass. As the pitch increases, the sound's decibel level decreases. RELATIVE SOUND PRESSURE SOUND VOLUME IN KILOPASCALS IN DECIBELS 4 3.9 kPa 20 10 Grass Grass 2 -10 1 1.3 kPa Snow -20 Snow -30 -1 -40 25 50 75 100 50 100 150 200 250 MILLISECONDS AFTER BLAST FREQUENCY IN HERTZ Source: Cold Regions Research and Engineering Laboratory TIM MEKO DISPATCH


shared by timmeko on Feb 21
Have you ever noticed how quiet it is when it snows? This infographic explains how sound is muffled by a blanked of freshly-fallen snow.


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