For the He ion ( )

CHEMISTRY · Subjective · CBSE · Chemistry · Structure of Atom · Structure of Atom

Problem

For the He

^{+}

ion (

Z=2

), an electron makes a transition from the

n=4

orbit to the

n=2

orbit. (a) Calculate the energy released in electron-volts (eV). (b) Hence find the wavelength of the emitted photon in nanometres. Take

h=6.63\times10^{-34}\,\text{J s}

c=3.00\times10^{8}\,\text{m s}^{-1}

and

1\,\text{eV}=1.6\times10^{-19}\,\text{J}