A crystal has regularly spaced atoms that can act like a diffraction grating (which has many evenly spaced slits). Diffraction patterns form when the wavelength of a photon is similar in size to the spacing between atoms. Consider a crystal where the atomic spacing is 0.32m, and a
photon of wavelength equal to this spacing. What part of the electromagnetic spectrum is
such a photon?
a. gamma ray
b. infrared
c. ultraviolet
d. x-ray
e. visible light



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