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$\lambda_1 = \lambda_2$
- B$\lambda_1 = 2\lambda_2$
- C$\lambda_1 = 4\lambda_2$
- D$\lambda_1 = 0.5\lambda_2$
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