# Homework Help: Energy required by an electron

1. Sep 4, 2006

### Reshma

I am quite clueless over this.

Calculate what energy needs to be given to electrons so that they are able to probe the nuclear size.

Is the radius of the nucleus (~1Fermi) relevant in this problem? Help needed..

2. Sep 4, 2006

### inha

Your guess is right. For example x-rays can be used to probe the structure of solids because their wavelengthsm are of the same order of magnitude than atomic spacings in solids.

3. Sep 5, 2006

### Reshma

So, I have to take the de Broglie wavelength as 10-15m and substitute in $\lambda = \frac{h}{\sqrt{2mE}}$ and obtain the KE, right?