Discuss the experimental results of Geiger-Marsden's $\alpha $ -particle scattering.
A typical graph of the total number of $\alpha$-particles scattered at different angles in a given interval of time is shown in below figure.
The dots in this figure represent the data points and the solid curve is the theoretical prediction based on the assumption that the atom has positively charged nucleus.
Many of the $\alpha$-particles pass through the foil.
It means that they do not suffer any collisions.
Only about $0.14 \%$ of the incident $\alpha$-particles scatter by more than $1^{\circ}$ and about $1$ in $8000$ deflect by more than $90^{\circ}$.
In a hydrogen atom, the electron is in $n^{th}$ excited state. It may come down to second excited state by emitting ten different wavelengths. What is the value of $n$ :
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
An alpha nucleus of energy $\frac{1}{2}mv^2$ bombards a heavy nuclear target of charge $Ze.$ Then the distance of closest approach for the alpha nucleus will be proportional to
What radioactive source did the Geiger and Marsden use in the scattering experiment?
Explain Rutherford's explanation for scattered $\alpha $ -particles.