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Encyclopedia :
P :
PE :
PET :
Petahertz |
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PetahertzA petahertz (symbol PHz) is a measure of frequency equal to a quadrillion hertzor a thousand terahertz. In the electromagnetic spectrum, the low end of the petahertz range includes ultraviolet light, visible light, and infrared light, while the upper range includes X-rays and gamma rays. See also SI prefix. terahertz << petahertz << exahertz
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