Q.

Given the value of Rydberg constant is 107m-1, the wave number of the last line of the Balmer series in hydrogen spectrum will be

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a

0.25×107 m-1

b

2.5×107 m-1

c

0.025×104 m-1

d

0.5×107 m-1

answer is A.

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Detailed Solution

Here, R=107 m-1The wave number of the last line of the Balmer series in hydrogen spectrum is given by1λ=R122-1∞2=R4=1074=0.25×107 m-1
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Given the value of Rydberg constant is 107m-1, the wave number of the last line of the Balmer series in hydrogen spectrum will be