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JEE Main202125 Feb 2021Evening ShiftPhysicsAtomic PhysicsActual

The wavelength of the photon emitted by a hydrogen atom when an electron makes a transition from n = 2 to n = 1 state is:

Options

  1. A121 . 8   nm
  2. B194 . 8   nm
  3. C490 . 7   nm
  4. D913 . 3   nm

Correct answer

A. 121 . 8   nm

Step-by-step solution

1 λ = R 1 1 2 - 1 2 2 λ = 121 . 8   nm

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