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Electronic transition in He^(+) ion take...

Electronic transition in `He^(+)` ion takes from `n_(2) " to " n_(1)` shell such that :
`2n_(2)+3n_(1)=18`
`2n_(2)+3n_(1)=6`
What will be the total number of photons emitted when electrons transit to `n_(1)` shell?

A

21

B

15

C

20

D

10

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NARENDRA AWASTHI-ATOMIC STUCTURE-Exercise
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  2. The spectrum produced from an element is :

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  5. Multiple or fine structure of spectral lines is due to :

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  9. What is the energy (kJ/mol) associated with the de-excitation of an el...

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  10. What is the shortest wavelength line in the Paschen series of Li^(2+) ...

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  11. What is the maximum wavelength line in the Lyman series of He^(+) ion?

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  12. Which of the following electron transitions in a hydrogen atom will re...

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  13. Which electronic transition in a hydrogen atom, starting from the orbi...

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  18. The H-spectrum confirms

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