Time management is very much important in IIT JAM. The eduncle test series for IIT JAM Mathematical Statistics helped me a lot in this portion. I am very thankful to the test series I bought from eduncle.
Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Prashant kumar
Since the first order perturbation in the ground state of hydrogen atom will be zero for linear perturbation. I clear u why this is linear since this is electric field in z direction therefore the the perturbation will be Eo rCos theta because z=rCos theta. The second order perturbation will exist in the ground state of hydrogen atom. therefore in second order perturbation energy constant term Eo will be squared Hence value of n will be 2.