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Question

If the shortest wavelength in Lyman series of hydrogen atom is A, then the longest wavelength in Paschen series of He+ is :
  1. 36A7
  2. 5A9
  3. 36A5
  4. 9A5

A
36A5
B
36A7
C
5A9
D
9A5
Solution
Verified by Toppr

For Lyman series hydrogen atom, the shortest wavelength corresponds to:
n1=1 and n2=

1λ=RZ2[1n211n22]

1A=R[11212]

1A=R .....(1)

For Paschen series of He+ ion, the longest wavelength corresponds to :
n1=3 and n2=4

1λ=RZ2[1n211n22]

1λ=1A×22×[132142]

λ=36A7

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