engineering recuitment BARC Stipendiary Trainee Category I 2023 Mock Test Physics Atoms X Rays and the Ordering of the Elements
The spacing between layers of atoms in KCl crystal is 3.1 × 10-10 m. A beam of X-rays is constructively scattered in first order from the surface of the crystal at an angle of 2.9°. The wavelength of X-rays is ______ (sin 2.9° = 0.0506)
1
1.32 × 10-11 m
2
3.71 × 10-11 m
3
4.24 × 10-11 m
4
3.14 × 10-11 m