When a hydrogen atom is raised from the ground state to an excited state:

  1. Both K.E and P.E increase
  2. Both K.E and P.E decrease
  3. P.E increases, K.E decreases
  4. K.E increases, P.E decreases


Answer:

When a hydrogen atom is raised from the ground state to an excited state: P.E increases, K.E decreases

Helping Concept:

  1. Kinetic energy = ke2/2r
  2. As r increases kinetic energy decreases and tends to zero for higher orbits.
  3. Potential energy = -ke2/r
  4. Potential energy increases as r increases because P.E is less negative as we move from lower orbit to higher orbit. (less negative mean P.E increases)

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