Question

calculate the wavelength of spectral line obtained in the spectrum og Li^(2+) in the lyman spectrum from n=3​

Answer 1

Let the transition occurs in between the levels n

1

and n

2

. Thus, if then given

n

1

+n

2

=4

n

2

−n

1

=2 ∴n

2

=3,n

1

=1

Therefore,

λ

1

=R

H

×Z

2

[

1

2

1

−

3

2

1

] (∵Z=3 for Li)

=109678×3

2

×[8/9]

∴λ=1.14×10

−6

cm

Answer 2

Answer:

Correct option is

C

λ=1.14×10−6cm

Let the transition occurs in between the levels n1 and n2. Thus, if then given

n1+n2=4

n2−n1=2        ∴n2=3,n1=1

Therefore, λ1=RH×Z2[121−321]     (∵Z=3 for Li)

=109678×32×[8/9]

∴λ=1.14×10−6cm

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