Physics - Modern Physics Question with Solution | TestHub

The work function of the metal$\mathrm{A}$is equal to the ionization energy of the hydrogen atom in the first excited state. The work function of the metal$\mathrm{B}$is equal to the ionization energy of${\mathrm{He}}^{+}$ion in the second orbit. Photons of the same energy$E$are incident on both$\mathrm{A}$and$\mathrm{B}$. The maximum kinetic energy of photoelectrons emitted from$\mathrm{A}$is twice that of photoelectrons emitted from$\mathrm{B}$. Value of$E$( in$\mathrm{eV}$) is