# AP Physics C Question: The total energy of the electron in a hydrogen atom is normally −13.6 eV....

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Homework Statement:
The total energy of the electron in a hydrogen
atom is normally −13.6 eV.
Which one statement below, based on this
fact, is correct?
1. The work required to completely remove
the electron from the atom is 13.6 eV.
2. The electron is in a circular orbit with a
kinetic energy of 6.8 eV.
3. The electron has a potential energy of
−27.2 eV and a kinetic energy of +13.6 eV.
4. The kinetic energy of the electron in the
atom is +27.2 eV.
5. The potential energy of the electron in
the atom is −13.6 eV.
6. The electron stays at a “classical turning
point” such that the potential energy is +13.6
eV.
Relevant Equations:
Potential plus kinetic equals total energy
Homework Statement:: The total energy of the electron in a hydrogen
atom is normally −13.6 eV.
Which one statement below, based on this
fact, is correct?
1. The work required to completely remove
the electron from the atom is 13.6 eV.
2. The electron is in a circular orbit with a
kinetic energy of 6.8 eV.
3. The electron has a potential energy of
−27.2 eV and a kinetic energy of +13.6 eV.
4. The kinetic energy of the electron in the
atom is +27.2 eV.
5. The potential energy of the electron in
the atom is −13.6 eV.
6. The electron stays at a “classical turning
point” such that the potential energy is +13.6
eV.
Homework Equations:: Potential plus kinetic equals total energy

I have attempted both 3 and 5, both wrong. It makes sense to me that for 3 it would add up to be -13.6, but for some reason, this is not the answer. Please help