The kinetic energy of electrons is 10^-20 J and the photons also have the same energy. The wavelengths associated with these particles are ${\mathrm{\lambda }}_{\mathrm{e}}$ and ${\mathrm{\lambda }}_{\mathrm{ph}}$ respectively. These wavelengths are related in the following way

• A

  ${\mathrm{\lambda }}_{\mathrm{ph}}={\mathrm{\lambda }}_{\mathrm{e}}$

• B

  ${\mathrm{\lambda }}_{\mathrm{ph}}<{\mathrm{\lambda }}_{\mathrm{e}}$

• C

  ${\mathrm{\lambda }}_{\mathrm{e}}/{\mathrm{\lambda }}_{\mathrm{ph}}=\mathrm{c}$

• D

  ${\mathrm{\lambda }}_{\mathrm{ph}}>{\mathrm{\lambda }}_{\mathrm{e}}$