Schrodinger equation and hydrogen atom

[quietrain]

Homework Statement

Find the width L of a one-dimensional box for which n=5 level would correspond to the absolute value of the n=3 state of a hydrogen atom

Homework Equations

am i suppose to use n²h²/8mL² where n=5 to equate it to the n=3 state of the hydrogen atom? which is -13.6eV/3²?

The Attempt at a Solution

i am confuse. or am i suppose to be using some other equations? i don't really understand the question though. appreciate any help

 

[ehild]

You have to use these equations. Omit the signs, the absolute values have to be equal. m is the mass of the electron, and convert eV to joule.

ehild

 

[quietrain]

ah i see.. thanks a lot!