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JEE Main 20188 April
Exam
JEE Main
Year
2018
Date
8 April
Subject
Physics
Chapter
Atomic Physics

JEE Main 2018 · 8 April · Physics · Atomic Physics

If the series limit frequency of the Lyman series is V _ L , then...

If the series limit frequency of the Lyman series is VL,{V}_{L}, then the series limit frequency of the Pfund series is:

Options

  1. AVL25\dfrac{{V}_{L}}{25}
  2. B25VL25{V}_{L}
  3. C16VL16{V}_{L}
  4. DVL16\dfrac{VL}{16}

Correct answer

A. VL25\dfrac{{V}_{L}}{25}

Step-by-step solution

⇒V2=RCZ2(112−1∞2)⇒ {V}_{2} = RC{Z}^{2}\left(\dfrac{1}{{1}^{2}} - \dfrac{1}{{\infty}^{2}}\right)

V2=RCZ2{V}^{2} = RC{Z}^{2}

Series limit frequency of the Pfund series,

Vp=RCZ2(152−1∞2){V}_{p} = RC{Z}^{2}\left(\dfrac{1}{{5}^{2}} - \dfrac{1}{{\infty}^{2}}\right)

Vp=VL25{V}_{p} = \dfrac{{V}_{L}}{25}
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