exahertz


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ex·a·hertz

 (ĕk′sə-hûrts′)
n. Abbr. EHz
One quintillion (1018) hertz.

exahertz

(ˌɛksəˈhɜːts)
n
(Units) a very large unit of frequency equal to one quintillion hertz
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References in periodicals archive ?
X-rays at the short end of the spectrum are from 10 to 0.01 nanometers long with frequencies of 30 petahertz to 30 exahertz, and gamma rays are even shorter.
He further said that Electromagnetic Radiation (EMR) can only be dangerous if emitted radiations are beyond safety limits or if the frequency of the radiation (ionizing radio frequency) falls within 0.3-30 Ehz (exahertz or million gigahertz) as in gamma rays and X-rays.
With the help of new computational techniques brought about by refinements in both hardware and software, don't be surprised to hear of petahertz ([10.sup.15] Hz) and even exahertz ([10.sup.18] Hz) a few years from now.