IIT JAMChemistrySolid StateNumerical+1 / −0
The *d* spacing for the first-order X-ray (λ = 1.54 Å) diffraction event of metallic iron (*fcc*) at 2θ = 20.2° is Å. (*round off to three decimal places*)
Numerical answer
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Correct answer: 4.390, 4.400
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