Question

An electron revolving round the nucleus in an orbit whose angular momentum equal to $\frac{0.5h}{\pi }$ can lose energy?

Answer 1

If an electron revolving round the nucleus in an orbit whose angular momentum equal to 0.5h/π (Atom is in 1^st orbit) do not lose the energy if it lose the energy the electron will fall into the nucleus and the atom will collapse

So the electron do not lose the energy.