Sunday, September 25, 2011

Thunder and Lightening

Dijukno Lightening Causes Thunder?  Thunder is the sound caused by rapidly expanding gases along a channel of lightning discharge. Energy from lightning heats the air to around 18,000 degrees Fahrenheit. This causes a
rapid expansion of the air, creating a sound wave heard as thunder. An initial tearing sound is usually caused by the stepped leader, and the sharp click or crack heard at a very close range, just before the main crash of thunder, is caused by the ground streamer. Thunder is rarely heard at points farther than 15 miles from the lightning discharge, but occasionally can be heard up to 25 miles away. At these distances, thunder is heard as more of a low rumbling sound because the higher frequency pitches are more easily absorbed by the surrounding environment, and the sound waves set off by the lightning discharge have different arrival times.

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