An Electron Is Trapped in a Deep Well with a Width

Multiple Choice

An electron is trapped in a deep well with a width of 0.3 nm.If it is in the state with quantum number n = 3 its kinetic energy is:

A) 6.0 * 10^-28 J
B) 1.8 *10^-27 J
C) 6.7*10^-19 J
D) 2.0 *10^-18 J
E) 6.0 * 10^-18 J