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Q.

If λ1 and λ2 are the wavelengths of the third member of Lyman and first member of the Paschen series respectively , then the value of λ1:λ2 is:

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a

1:9

b

7:108

c

1:3

d

7:135

answer is D.

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Detailed Solution

Case 1 : hcλ1=13.6112−142Case 2: λcλ2=+13.6132−142∴λ1λ2=16−9/9×1616−1/1×16=7135
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If λ1 and λ2 are the wavelengths of the third member of Lyman and first member of the Paschen series respectively , then the value of λ1:λ2 is: