A $10\; kg$ satellite circles earth once every $2 \;hours$ in an orbit having a radius of $8000\; km$. Assuming that Bohr's angular momentum postulate applies to satellites just as it does to an electron in the hydrogen atom, find the quantum number of the orbit of the satellite.

According to classical theory, Rutherford atom was

Ratio of longest wave lengths corresponding to Lyman and Balmer series in hydrogen  spectrum is

What was the thickness of the gold foil kept in the Geiger-Marsden scattering experiment?

Rutherford’s $\alpha$-particle experiment showed that the atoms have