Q.
For the Balmer series in the spectrum of H atom,the correct statements
among (I) to (IV) are:
I) As wavelength decreases, the lines in the
series converge
II) The integer n1 is equal to 2
III) The lines of longest wavelength corresponds to n2 = 3
IV) The ionization energy of hydrogen can be calculated from wave number of these lines
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a
(II), (III), (IV)
b
(I), (II), (III)
c
(I), (II), (IV)
d
(I), (III), (IV)
answer is B.
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Detailed Solution
Here n=2 since Balmer series, the transition is between some energy level n2
and n1=2.
As the wave length decreases, the wave number increases. This implies that the differencealso increases or ultimately n2 increases. As n2increases , the lines in the series converge. Ionization energy of hydrogen can be calculated from wave number of lines in lyman series as the electron is present in n=1.Longest wave length.
corresponds to minimum difference betweeen this is for n2=3

