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13. X-ray is discovered by Wilhelm Conrad Rontgen and widely used in different areas. About the X-ray, which one is incorrect?
(A) The wavelength of X-ray is shorter than that of visible light.
(B) X-ray was discovered when Rontgen operated the cathodic tube.
(C) X-ray diffraction (XRD) over the crystal is a kind of inelastic scattering.
(D) The soft X-ray dissipates quickly at ambient.
(E) Bragg equation: 2dsinθ= nλ