NEET2010PhysicsAtomic PhysicsActual
The electron in the hydrogen atom jumps from excited state (n=3) to its ground state (n=1) and the photons thus emitted irradiate a photosensitive material. If the work function of the material is 5.1 eV , the stopping potential is estimated to be (the energy of the electron in n th state E _ n =- 13.6 n ^2 eV )
Options
- A5.1 ~V
- B12.1 ~V
- C17.2 ~V
- D7 ~V
Correct answer
D. 7 ~V
Step-by-step solution
For n=1, E ₁=- 13.6 (1)^2 =-13.6 eV and for n=3, E₃=- 13.6 (3)^2 =-1.51 eV So, required energy array l E = E ₃- E ₁ =-(1.51)-(-13.6) =12.09 eV E = W + eV eV = E - W eV =(12.09-51) e =7 volt array