The number of radial nodes in 3s and 2p respectiely are

The uncertainty in the momentum of an electron is $$2.0 \times 10^{-8} \mathrm{~kg} \mathrm{~ms}^{-1}$$. The uncertainty in its position will be

In which of the following photoelectric effect is observed?

An electron in H-atom in its ground state absorbs 1.50 times as much as energy as the minimum required for its escape $$(13.6 \mathrm{~eV})$$ from the atom. Thus, KE given to emitted electron is