engineering recuitment BARC Stipendiary Trainee Category I 2023 Mock Test Physics Atoms X Rays and the Ordering of the Elements
A family of planes of spacing 0.2518 nm of NaCI crystal reflects a beam of X-ray in first order at an angle of 30°. The wavelength of X-rays is:
1
0.2518 nm
2
0.1259 nm
3
0.3778 nm
4
0.5036 nm