Given the value of Rydberg constant is 107m-1, the waves number of the lest line of the Balmer series in hydrogen spectrum will be: (1) 0.025�104m-1 (2) 0.5�107m-1 (3) 0.25�107m-1 (4) 2.5�107m-1

Answer: (3)

We know that:

λ1= R(1/n12−1/n22)

For last line Balmer’s series,

n1=2 and n2=∞

λ1= 107(1/22−1/∞2)

λ1= 0.25×107m−1

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