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## Homework Statement

Electrons are accelerated to an energy of 2.40 keV and then passed through a thin graphite film. The distance between the carbon atoms is 1.42 * 10^-10 m.

## Homework Equations

b) Describe the diffraction pattern on a screen 5.00 cm from the graphite film. We're looking for x.

## The Attempt at a Solution

Well first I found the wavelength. I'm sure I got this part right.

E = 1/2mv^2

then using v, I found lambda in mv = h/lambda

Now to solve the above question for x, I used ,

lambda = xd/nl

but I get a slightly different result from the supposed answer. The answer is 8.84 * 10^-3m yet I keep getting 8.83 * 10^-3 m. I kept all the digits and I keep getting this. Can anyone help?

Does the angle matter?