Visitor rating
A pictorial representation of the frequency spectrum dances across the screen, as viewers learn where TV and radio signals, microwaves and X-rays are on the spectrum.
National Audiovisual Center, 5285 Port Royal Rd., Springfield, VA 22161, Phone: (703)605-4603, Toll-free: 800-553-6847, Fax: (703)321-8547, Email: orders@ntis.fedworld.gov, URL: http://www.ntis.gov/products/nac/index.asp
Available on VHS
Running time 15 minutes.
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