Give the relationship between impact parameter and scattering angle.
$X$-rays incident on a material
The gravitational attraction between electron and proton in a hydrogen atom is weaker than the coulomb attraction by a factor of about $10^{-40} .$ An alternative way of looking at this fact is to estimate the radius of the first Bohr orbit of a hydrogen atom if the electron and proton were bound by gravitational attraction.
In Bohr model of hydrogen atom, the force on the electron depends on the principal quantum number as
What was the thickness of the gold foil kept in the Geiger-Marsden scattering experiment?
What radioactive source did the Geiger and Marsden use in the scattering experiment?