What is plum pudding model of the atom ?
Ratio of longest wavelengths corresponding to Lyman and Balmer series in hydrogen spectrum is
Why atoms are electrical neutral ?
If the force between the electron in the first Bohr orbit and the nucleus (proton) in hydrogen atom is $F$, then the force between them when the electron is in the second orbit is
The absorption transitions between the first and the fourth energy states of hydrogen atom are $3.$ The emission transitions between these states will be
An electron is moving round the nucleus of a hydrogen atom in a circular orbit of radius $r$. The Coulomb force $\vec{F}$ between the two is