Q.38 In the X-ray diffraction pattern recorded for a simple cubic solid (lattice parameter a=1 A) using X rays of wavelength 1 A, the first order diffraction peak(s) would appear for the (A) (100) planes (C)(210) planes (B) (112) planes (D) (220) planes 9/13 PH
Just put the options and values of h, k and l, you will see that for (112), (210) and (220) , value of sintheta is greater than 1 which is not in range of sintheta..... So correct ...