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BITSAT2023PhysicsAtomic PhysicsActual

A 12.5 eV electron beam is used to bombard gaseous hydrogen at room temperature. The number of spectral lines emitted will be:

Options

  1. A2
  2. B1
  3. C3
  4. D4

Correct answer

C. 3

Step-by-step solution

If we assume electron in hydrogen atom takes energy 12.09 eV from the incoming radiation, the maximum excited state of electron will be n=3 . So, number of spectral lines is 3(3-1) 2 =3 . Here we assume some part of energy 12.5 eV -12.09 eV =0.41 eV get lost due to collision.

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