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

What is the total number of electrons that can have the values $$n=2, l=1, s=1 / 2$$ in the electronic configuration $$1 s^2 2 s^2 2 p^3$$ ?