JEE Advanced 2015 Paper 1 Physics Q2

Physics · Atoms & Spectra

Problem

Consider a hydrogen atom with its electron in the

n^{\rm th}

orbital. An electromagnetic radiation of wavelength

90\,\mathrm{nm}

is used to ionize the atom. If the kinetic energy of the ejected electron is

10.4\,\mathrm{eV}

, then the value of

n

is (

hc=1242\,\mathrm{eV\,nm}

)