Electron in infinite well equation

[ZedCar]

Homework Statement

An electron is confined in an infinitely deep well of width 0.1nm, about the size of an atom. Estimate the energy of the ground state in eV.

Homework Equations

Is this the equation I should be using?

E=(n^2 hbar^2 ∏^2)/(2m L^2)

The Attempt at a Solution

 

[collinsmark]

Is this the equation I should be using?

Yes, assuming you're using 1-dimension. (The way the problem statement was worded, it sounds to me like 1-dimensional quantum mechanics is a reasonable assumption.)