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When X rays of wavelength 1.24 are diffracted by a metallic crystal, the angle of first- order diffraction(n = 1) is measured to be

When X rays of wavelength 1.24 are diffracted by a metallic crystal, the angle of first- order diffraction(n = 1) is measured to be 17.5. What is the distance(in pm) between the layers of atoms responsible for the diffraction?

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