An electron of mass m and a photon have same energy E. The ratio of de-Broglie wavelengths associated with them is :

Question

( A ) $c(2mE)^{\frac{1}{2}}$
( B ) $ (\frac{E}{2m})^{\frac{1}{2}}$
( C ) $\frac{1}{c} (\frac{2m}{E})^{\frac{1}{2}}$
( D ) $\frac{1}{c} (\frac{E}{2m})^{\frac{1}{2}}$