public marks

PUBLIC MARKS with tags earth & radio

April 2008

VLF Radio Signals

by rike_
The source of most natural radio signals is lightning. When a lightning bolt strikes, a massive amount of charge is moved and this acts in much the same way as moving charge in a radio transmitting antenna. The frequencies emitted by lightning range from 0 Hz to over 100 kHz with all frequencies being emitted simultaneously with the visible flash of lightning.

October 2006

PUBLIC TAGS related to tag earth

district +   gases +   gr4 +   health +   life cyles +   moon +   science +   sounds +   states of matter +   sun +   upper wing +  

Active users

rike_
last mark : 27/04/2008 17:41

starexplorer
last mark : 03/10/2006 17:26