1. A beam of X-rays of wavelength 0.071 nm is diffracted by (110) plane of rock salt with lattice constant of 0.28 nm. Find the glancing angle for the second-order diffraction.
(Set-1–Sept. 2007),(Set-2, Set-3–Sept.2006), (Set-2–May 2006), (Set-3–May 2004), (Set-4–May 2003)
Sol: Given data are:
Wavelength (λ) of X-rays = 0.071 nm
Lattice constant (a) = 0.28 nm
Plane (hkl) = (110)
Order of diffraction = 2
Glancing angle θ = ?
Bragg’s law is 2d sin θ = nλ
Substitute in Bragg’s equation
2. A beam of X-rays is incident ...