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Question

The ratio of the wave number of 1st line of Balmer series to last line of Lyman series in Hatom is:

A
365
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B
536
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C
13
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D
3
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Solution

The correct option is B 13
Here the answer is wrong, and the correct answer is not mentioned in option i.e., 4.

For the first balmer series:

1λb=R[12212]

λb=4R

For the last lyman series:

1λ1=R[12212]

λ1=1R

λbλ1=4R1R

λbλ1=4

Here the option given is 3 which is 4 is the answer.

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