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Question

Ratio of longest wave lengths corresponding to Lyman and Balmer series in hydrogen spectrum is -

A
527
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B
323
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C
729
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D
931
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Solution

The correct option is A 527
1λl=R(1)2[112122]=3R4
λl=43R (1)
1λb=R(1)2[122132]=5R36
λb=365R (2)
λlλb=43R×5R36=53×9=527

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