Atoms Test - 26...

The main defect of Bohr's atom model is :

The electron is present in an orbit of energy state $$-1.51$$ eV, then angular momentum of the electron is

The possible values of principal quantum number can be:

The radius of shortest orbit in one electron system is $$18$$ pm.It may be.

Atomic hydrogen is excited to the nth energy level.The maximum number of spectral lines which  it can emit while returing to the ground state, is

If $$A_{n}$$ is the area enclosed in the nth orbit in a hydrogen atom then the graph log $$\left ( \dfrac{A_{n}}{A_{1}} \right )$$ against log $$n$$

If an electron is revolving round the hydrogen nucleus at a distance of $$0.1\ nm$$, the speed should be :

The $$\alpha$$-particles with initial kinetic energy $$4.8$$ mev are shot at gold atoms $$(z=79)$$. The potential of $$\alpha$$-particle at the closest distance to the gold nucleus is

When an electron jumps from higher orbit to the second orbit in hydrogen, the radiation emitted out will be in $$(R=1.09\times 10^{7}m^{-1})$$

The maximum number of photons emitted by an H-atom, if atom is excited to states with principal quantum number four is