The energy level diagram for hydrogen
-The smallest energy of an absorbed photon that will raise a hydrogen atom from its ground state to its first excited state is
A)1.5 eV.
B)1.9 eV.
C)3.4 eV.
D)10.2 eV.
E)13.6 eV.

Question

The energy level diagram for hydrogen 
-The smallest energy of an absorbed photon that will raise a hydrogen atom from its ground state to its first excited state is
A)1.5 eV. 
B)1.9 eV. 
C)3.4 eV. 
D)10.2 eV. 
E)13.6 eV.

Quizplus · Accepted Answer

The energy difference between the ground state and the first excited state of a hydrogen atom is 10.2 eV. This is the energy required to transition from the n=1 level to the n=2 level.

The Energy Level Diagram for Hydrogen