What is the wavelength of a beam of x rays which is diffracted by a crystal in a direction making an angle of 60° with the Incident beam and corresponding to first order 'reflection' from crystal lattice planes separated by 3 × 10⁻¹⁰ m?
Options

Question

What is the wavelength of a beam of x rays which is diffracted by a crystal in a direction making an angle of 60° with the Incident beam and corresponding to first order 'reflection' from crystal lattice planes separated by 3 × 10⁻¹⁰ m?

Options

G1 Physics · Accepted Answer

The angle between incident and diffracted beams is 60°, so the Bragg glancing angle is θ=30°. For first order, λ=2d sinθ=2(3 Å)(1/2)=3 Å. Hence option C.