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Question

The wavelength of the first line of the Balmer series of He+ ion is x times the last line . x is


Solution

Balmer series can be resulted in transitions from (n2=3,4,5,6 etc) to n1=2
The first line corresponds to transition from n2=3 to n1=2
The last line corresponds to transition from n2= to n1=2

1λ1=4R(1419)
1λ=4R(1412)

λ1λ=3620=1.8
 

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