# How to convert this into eV

## Homework Statement

well the problem is electron moving in an infinte poentail box of dimensions.... calc all posible energy level in (eV)

## Homework Equations

E=h2/8M(nx2/a2+....

## The Attempt at a Solution

ok so no idea how they get h2/8M to = 37.6 h is planks constant the units are in m4kg s-2 but eV is in m2kg s-2 dont see how they get 37.6 for mass i used 9.11e-31

Pengwuino
Gold Member
Find out the energy levels in Joules and simply use the conversion between Joules and eV. Should be easily google'd/wikipedia'ed or should be in your textbook.

vela
Staff Emeritus
Homework Helper
$$\frac{h^2}{8m} = \frac{(hc)^2}{8mc^2} = 0.376~\text{eV nm}^2$$Note that this combination has two powers of length. They are needed to cancel the units from a2 in the denominator of the formula for the energy.