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NEET 2015
Exam
NEET
Year
2015
Subject
Physics
Chapter
Atomic Physics

NEET 2015 · Physics · Atomic Physics

In the spectrum of hydrogen, the ratio of the longest wavelength in...

In the spectrum of hydrogen, the ratio of the longest wavelength in the Lyman series to the longest wavelength in the Balmer series is:

Options

  1. A94\dfrac{9}{4}
  2. B275\dfrac{27}{5}
  3. C527\dfrac{5}{27}
  4. D49\dfrac{4}{9}

Correct answer

C. 527\dfrac{5}{27}

Step-by-step solution

1λ1=Re(112−122)\dfrac{1}{{\lambda}_{1}} = {R}_{e}\left(\dfrac{1}{{1}^{2}} - \dfrac{1}{{2}^{2}}\right)
1λ2=Re(122−132)\dfrac{1}{{\lambda}_{2}} = {R}_{e}\left(\dfrac{1}{{2}^{2}} - \dfrac{1}{{3}^{2}}\right)
λ1λ2=527\dfrac{{\lambda}_{1}}{{\lambda}_{2}} = \dfrac{5}{27}
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