The electron in hydrogen atom is initially in the third excited state. When it finally moves to ground state, the maximum number of spectral lines emitted are

Two different logic gates moving output '0' for the inputs (0, 1) and then for (1, 0) are

A straight conductor of length 0.6 M is moved with a speed of 10 ms$$^{-1}$$ perpendicular to magnetic field of induction 1.2 weber m$$^{-2}$$. The induced e.m.f. across the conductor is

If the electron in a hydrogen atom moves from ground state orbit to 5^th orbit, then the potential energy of the electron