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.
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?