# Atomic line spectra | Early Quantum Theory

Calculate the wavelength of the line in the Lyman series that results from the transition n=4 to n=1.
Is light absorbed or emitted during this process?

E4 > E1 ⇒ E = E4 – E1 =  = 2.04 x 10-18 J

E = $\frac{\mathrm{hc}}{\mathrm{\lambda }}$ ⇒ λ = $\frac{\mathrm{hc}}{\mathrm{E}}$ = 9.74 x 10-8 m

E4 > E1 ⇒ emission