"Of course, human ears can't directly sense radio signals. If Keay is
right, something on the ground -- a 'transducer' -- must be converting
radio waves into sound waves. In laboratory tests, Keay finds that
suitable transducers are surprisingly common. Simple materials like
aluminum foil, thin wires, pine needles -- even dry or frizzy hair --
can intercept and respond to a VLF field."
"Here's how it works: Radio waves induce currents in electrical
conductors. 'Strong, low-frequency currents can literally shake ordinary
objects,' explains Dennis Gallagher, a space physicist at the NASA
Marshall Space Flight Center. 'When things shake, they launch vibrations
into the air, which is what we hear.'"
Best wishes,
Larry
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Larry Cartwright <exit60@cablespeed.com>
Retired (June 2001) Physics Teacher
Charlotte MI 48813 USA
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