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Question

In a hydrogen atom, the energy of an electron in an orbit is 3.4 eV. When it is excited to the next higher energy level and comes back to ground state, calculate the wavelength of emitted radiation.

Solution
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As we know,
E=13.6n2×Z2,Z=1 for H atom
E=13.6n21=3.4eV
n1=2
Electron is excited to next level of n1i.e.,n2=3.
Electron transition n2=3n3=1
n2=3,E2=21.72×10199 Joules

E2=21.72×10191 Joules

ΔE=2.414×1019 Joules

E=hcλ=6.314×1034×3×108λ

=2.414×1019J
λ=6.314×1034×3×1082.414×1019

λ=9×107m

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