3. If $\lambda_1$ is the wavelength required to excite an electron in H from 2s to 4p level, what is the wavelength emitted by the same electron when relaxing from 4p back to 1s level?
(A) $5\lambda_1$
(B) $2\lambda_1$
(C) $\lambda_1/2$
(D) $\lambda_1/4$
(E) $\lambda_1/5$

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