Day 206 of 365
July 25
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Physics The Physics of Sound
Sound is a pressure wave traveling through matter. It cannot travel through vacuum. The speed of sound varies with medium - about 343 m/s in air but 1,480 m/s in water. We hear frequencies between roughly 20 Hz and 20,000 Hz; elephants can hear infrasound, bats use ultrasound.
💡 Did you know?
The loudest natural sound was the 1883 Krakatoa eruption, heard 3,000 miles away!
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