22. A monochromatic X-ray beam of wavelength λ = 2.82×10⁻¹⁰ m is incident on a crystal. The first order diffraction maximum occurs when the grazing angle θ is 30°. Find the crystal plane spacing d.
(A) 3.98×10⁻¹⁰ m
(B) 4.88×10⁻¹⁰ m
(C) 1.99×10⁻¹⁰ m
(D) 1.63×10⁻¹⁰ m
(E) 2.82×10⁻¹⁰ m

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