A proton and an electron ate accelerated by the same potential difference.If ${\mathrm{\lambda }}_{\mathrm{e}}$ and ${\mathrm{\lambda }}_{\mathrm{p}}$ denote de Broglie wavelength of electron and proton, then

• A

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

• B

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

• C

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

• D

  none of above