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Two consecutive maxima of X-ray diffraction from a crystal with spacing d, are found at 20.8960...

Two consecutive maxima of X-ray diffraction from a crystal with spacing d, are found at 20.8960 and 26.477 0. The X-ray wavelength is λ=0.0214 nm .

a) what is the spacing d?

b) What is the order (n) for the maximum at 20.8960?

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