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

NTA Abhyas 2020 · Physics · Atomic Physics

Electrons having kinetic energy 30 eV are made to collide with...

Electrons having kinetic energy 3030 eV are made to collide with atomic hydrogen gas (in ground state)and42.5and 42. 5 % of electron energy is used to excite the hydrogen atoms. The number of emitted wavelengths in emission spectra are

Options

  1. A33
  2. B66
  3. C1212
  4. D1818

Correct answer

B. 66

Step-by-step solution

42 . 5 % of~of30eV = 12.75eV<br/><br/><br /><br />∴ {E}_{4} - {E}_{1} = - 0.85 - \left(- 13.6\right) = 12.75eV<br/><br/>So,itmeanselectronhasbeentransmittedfromgroundstateto<br /><br />So, it means electron has been transmitted from ground state to{3}^{rd}excitedstate(n=4)excited state \left(n = 4\right), so total number of unique wavelengths emitted are

=4×(4−1)2=6= \dfrac{4 \times \left(4 - 1\right)}{2} = 6
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