The ratio between total acceleration of the electron in singly ionized helium atom and hydrogen atom (both in ground state) is
$1$
$8$
$4$
$16$
Hydrogen $(H)$, deuterium $(D)$, singly ionized helium $(He^+)$ and doubly ionized lithium $(Li^{++})$ all have one electron around the nucleus. Consider $n = 2$ to $n = 1$ transition. The wavelengths of emitted radiations are $\lambda_1, \lambda_2 \lambda_3$ and $\lambda_4$ respectively.
An $\alpha$- particle of $5\ MeV$ energy strikes with a nucleus of uranium at stationary at an scattering angle of $180^o$. The nearest distance upto which $\alpha$- particle reaches the nucleus will be of the order of
The possible quantum number for $3d$ electron are
In the following diagram, which particle has highest $e/m$ value?
When the accelerating voltage applied on the electrons increased beyond a critical value