By using Bragg's diffraction, the spacing d is 0.112 nm.
We need to know about Bragg's diffraction to solve this problem. Bragg's diffraction is described how monochromatic light travels through a crystal medium. The monochromatic light should follow
2d.sin(θ) = λ
where d is the spacing between the planes of the crystal, θ is the incident light angle and λ is the wavelength.
From the question above, we know that
θ = 70⁰
λ = 0.210 nm = 0.21 x 10¯⁹ m
By substituting the given parameters, we get
2d.sin(θ) = λ
2d.sin(70⁰) = 0.21 x 10¯⁹
2d . 0.94 = 0.21 x 10¯⁹
d = 1.12 x 10¯¹⁰ m
d = 0.112 nm
For more on Bragg's diffraction at: https://brainly.com/question/13009361
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