Q.

In terms of Rydberg's constant R, the wave number of the first Balmer line is

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a

R

b

3R

c

5R36

d

8R9

answer is C.

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Detailed Solution

Wave number =1λ=R1n12-1n22For first Balmer line n1= 2, n2=3   Wave number =R122-132=R9-49×4=5R36
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