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Question : 9
Total: 26
A 12.5 eV
Solution:
(i) Writing E n ∝
(ii) Identifying the level to which the electron is emitted.
(iii) Calculating the wavelengths and identifying the series of atleast one of the three possible lines, that can be emitted.
(i) We haveE n ∝
(ii)∴
− 13.6 eV , − 3.4 eV , − 1.5 eV
∴ 12.5 eV n = 3
(iii) Energy values, of the emitted photons, of the three possible lines are
3 → 1 : ( − 1.5 + 13.6 ) eV = 12.1 eV
2 → 1 : ( − 3.4 + 13.6 ) eV = 10.2 eV
3 → 2 : ( − 1.5 + 3.4 ) eV = 1.9 eV
The corresponding wavelengths are : 102nm , 122 nm 653 nm
( λ =
)
(ii) Identifying the level to which the electron is emitted.
(iii) Calculating the wavelengths and identifying the series of atleast one of the three possible lines, that can be emitted.
(i) We have
(ii)
(iii) Energy values, of the emitted photons, of the three possible lines are
The corresponding wavelengths are : 102
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