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electromagnetic pulse

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Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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electromagnetic pulse  
n.   Abbr. EMP
  1. The pulse of intense electromagnetic radiation generated by a nuclear explosion.

  2. A pulse of electromagnetic radiation emitted by certain devices such as citizen band radio and cellular phones.

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Science Dictionary
electromagnetic pulse  
A pulse of intense electromagnetic radiation generated by certain physical events, especially by a nuclear explosion. The pulse includes a continuous spectrum of low frequencies and can interfere with the operation of electrical equipment.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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