12. The wavelength of first line of Balmer series of H-atom is - (R = Rydberg's constant)
(a) 36/5R (b)36R/5 (c)5R/36 (d)5/36R
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Answer:
first line of balmer series is 3–>2
Z for hydrogen is 1
so by Rydberg's formula we can solve it
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answer is 36/5r
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hope it's help you
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