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Manipal MET2016PhysicsAtomic Physics

The ionisation potential of hydrogen atom is 13.6 eV . How much energy need to be supplied to ionise the hydrogen atom in the first excited state?

Options

  1. A13.6 eV
  2. B27.2 eV
  3. C3.4 eV
  4. D6.8 eV

Correct answer

C. 3.4 eV

Step-by-step solution

Ionisation energy of nth state =-E_n For the first excited state, n=2 and energy in that state is, 13.6 2^2 eV = 13.6 4 eV =3.4 eV

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