Question

Ans this question please

Answer 1

3.
E = hc / λ
λ = hc / E
λ = (1240 eV nm) / (13.6 eV)
λ ≈ 91.2 nm

Option (d) is correct.
________________________

4.
E = 13.6 * (1/n1^2 - 1/n2^2)
= 13.6 * (1 - 1/9)
= 13.6 * 8/9
= 12.08 eV

λ = hc / E
= (1240 eV nm) / 12.08 eV
≈ 103 nm

Option (c) is correct.