Table of the Electromagnetic Spectrum

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True Story:

At the height of World War II, in 1942, the British Navy had a sudden breakdown in radio communications. The British became convinced that it was a German trick. It turned out to be disturbances caused by sunspots over 93 million miles away.

The True Story of Black Hawk Down from the A&E Video Store.

Cosmos Collector's Edition Boxed set - VHS

Carl Sagan's COSMOS is one of the most influential science programs ever made.

Q. Does the moon have a dark side?

A. The moon does have a far side which is impossible to see from the earth, but it doesn't mean that it's always dark. Each side of the moon is dark for no longer than 15 days at a time.

Q. Where does sound come from?

A. The air is always filled with sound waves. All things give off vibrations, but some have a low frequency which most cannot hear. The reason: it may take 3 minutes to make a single vibration. They may be caused by earthquakes and storms.

Table of the Electromagnetic Spectrum

Name of Wave	Wavelength in centimeters	Frequency in cycles
Cosmic rays	1 X 10^-12	3 X 10²²
Gamma rays	1 X 10^-10	3 X 10²⁰
X rays	6 X 10^-10	5 X 10¹⁹
Ultraviolet rays	1.2 X 10^-6	2.5 X 10¹⁶
Visible or radiant rays	4 X 10^-5	7.5 X 10¹⁴
Infrared rays	8 X 10^-5	3.75 X 10¹⁴
Heat rays	1 X 10^-2	3 X 10¹²
Electro-optical waves	4 X 10^-2	7.5 X 10¹¹
Radar	1	3 X 10¹⁰
Ultra short-wave radio	1 X 10²	3 X 10⁸
Short wave radio	1 X 10³	3 X 10⁷
Broadcast waves	1.87 X 10⁴	1.6 X 10⁶
Long wave radio	3 X 10⁶	1 X 10⁴

***Created from data in Secrets of the Universe by International Masters Publishing, Pittsburgh, 1999.

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