Physics - Modern Physics Question with Solution | TestHub

$\text{PE}=-\text{2 KE}=-2E$

Total Energy$= PE+KE=-2E+E\text{ =}-E$

$\Rightarrow -E= -\text{3.4 eV}$

$\text{or }E=\text{3.4 eV}$

Let$p$is momentum and$m$is mass of the electron

$E=\frac{p^2}{2m}$

or$p= \sqrt{\left(2mE\right)}$.

de Broglie wavelength$\lambda =\frac{h}{p}=\frac{h}{\sqrt{\left(2mE\right)}}$

$\lambda =\text{6.6 x}\text{1}{\text{0}}^{-10}\text{ m}$