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

needshelp
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

Moolisa
I would post this in the Introductory Physics Homework Help, I believe advanced physics homework help is meant for upper undergraduate and graduate level physics. You'll probably get more help there

Staff Emeritus
Homework Helper
Gold Member
What is your reasoning for 3 and 5 being right and the rest being wrong?