The de Broglie wavelength ($\lambda $) associated with a photoelectron varies with the frequency (v) of the incident radiation as, [v0 is threshold frequency] :
$\lambda \,\infty \,{1 \over {{{\left( {v - {v_0}} \right)}^{{3 \over 2}}}}}$
$\lambda \,\infty \,{1 \over {{{\left( {v - {v_0}} \right)}^{{1 \over 4}}}}}$
$\lambda \,\infty \,{1 \over {\left( {v - {v_0}} \right)}}$
$\lambda \,\infty \,{1 \over {{{\left( {v - {v_0}} \right)}^{{1 \over 2}}}}}$
