The masses of photons corresponding to the first lines of the Lymann and the Balmer series of the atomic spectrum of hydrogen are in the ratio of

(A)5:27

(B)1:4

(C)27:5

(D) 4:1

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Hydrogen Spectra

(c) $∆E$ = mc2. For Lymann series, m2c$\propto \left(\frac{1}{{1}^{2}}-\frac{1}{{2}^{2}}\right)$

For Balmer series, m2c$\propto \left(\frac{1}{{2}^{2}}-\frac{1}{{3}^{2}}\right)$

m1/m2 = (3/4) / (5/36) = 27/5 = m1:m2 = 27:5

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