Introduction X ray,
invisible, highly penetrating electromagnetic radiation
of much shorter wavelength (higher frequency) than visible light. The wavelength range for X rays is from about 10 - 8
m to about 10 - 11
m, or from less than a billionth of an inch to less than a trillionth of an inch; the corresponding frequency range is from about 3 × 1016
Hz to about 3 × 1019
Hz (1 Hz = 1 cps).
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