# The energies $E_1$ and $E_2$ of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths i.e. $\lambda_1$ and $\lambda_2$ will be:
( A ) $\lambda_1 = 2 \lambda_2$
( B ) $\lambda_1 = 4 \lambda_2$
( C ) $\lambda_1 = \frac{1}{2} \lambda_2$
( D ) $\lambda_1 = \lambda_2$