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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Physics
Chapter
Atomic Physics

NTA Abhyas 2020 · Physics · Atomic Physics

The radiation corresponding to the transitions of electrons from n...

The radiation corresponding to the transitions of electrons from n=2n = 2 to n=1n = 1 of hydrogen atoms, fall on He+{He}^{+} ions which are in n=1n = 1 and n=2n = 2 states. The possible transition of helium ions as they absorb energy from the radiation is

Options

  1. An=2→n=3n = 2 \to n = 3
  2. Bn=1→n=4n = 1 \to n = 4
  3. Cn=2→n=5n = 2 \to n = 5
  4. Dn=2→n=4n = 2 \to n = 4

Correct answer

D. n=2→n=4n = 2 \to n = 4

Step-by-step solution

E=13.6×1×(112−122)=10.2eVE = 13. 6 \times 1 \times \left(\dfrac{1}{12} - \dfrac{1}{22}\right) = 10. 2eV
For He+{He}^{+} in n=2n = 2,
10.2eV=13.6×4(122−1n2)<br/>10. 2eV = 13. 6 \times 4 \left(\dfrac{1}{22} - \dfrac{1}{n2}\right)<br />⇒ n = 4
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