List of top Physics Questions on X Rays and the Ordering of the Elements asked in IIT JAM PH

In an X-ray diffraction experiment with Cu crystals having lattice parameter \( 3.61 \, \text{Å} \), X-rays of wavelength of \( 0.090 \, \text{nm} \) are incident on the family of planes \( \{ 1 1 0 \} \). The highest order present in the diffraction pattern is .......
The wavelength of characteristic K\(_\alpha\) X-ray photons from Mo (atomic number 42) is ............. Å. (Round off to one decimal place).