The Coulomb potential V(r) = -e2/r of a hydrogen atom is perturbed by adding H' = bx (where b is a constant) to the Hamiltonian. The first order correction to the ground state energy is (The ground state wavefunction is ψ0 = 1√(πa03)e-r/a0):

Which movement aimed to promote Khadi, a hand-spun and handwoven cloth native to India?

Who were prominent leaders associated with the initial phase of the Telangana Rebellion (1946-1951) against the Nizam's rule and feudal landlords?

What was the immediate trigger for the Revolt of 1857?