Photons of energy 12.1 eV can excite hydrogen atoms. Find the maximum wavelength of the radiations emitted when electrons drop back to ground state -
Text Solution
Verified by ExpertsThe correct answer is:
A
Energy required by an electron to jump to
n = 3 level = 13.6 – 1.5 = 12.1 eV
Electron in n = 3 level an return to ground level in following ways
(i) n = 3 to n = 2 and then n = 2 to n = 1
(ii) n = 3 to n = 1
from n = 3 to n = 2
⇒ λ = 6563 Å
from n = 2 to n = 1
⇒ λ = 1215 Å
from n = 3 to n = 1
⇒ λ = 1026 Å
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