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Potatochip911
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Homework Statement
(image is clickable)The figure below shows the distribution of impacts on a screen (see image above) when a beam of electrons of energy ##2.5 \cdot 10^{-3}##eV passes through a single slit. The width of the slit is?
Homework Equations
##a\sin\theta=m\lambda \\
I(\theta)=I_{m}(\frac{\sin\alpha}{\alpha})^2 \\
\alpha=\frac{\pi a}{\lambda} \sin\theta \\
I_{0}=1\cdot 10^{-12}W/m^2##
The Attempt at a Solution
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Since it's a graph of ##I/I_{0}## and at ##\theta=0## the ratio is 1 the maximum intensity is therefore ##I_{0}##, It can also be seen that there is a minimum at 1 degree. So in the equation ##a\sin\theta=m\lambda## I am just missing the value for ##\lambda##. The intensity equation looks like it won't be solvable for ##\alpha## so I was wondering how to use the fact that they've given the energy passing through the slit. I'm confused as to how I'm supposed to use this information since it doesn't give the number of electrons going through the slit just "a beam of electrons".
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