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Homework Statement
At what energy will a non-relativistic calculation of the De Broglie wavelength of an electron be in error by 5%? What is this energy for a proton? Comment on your results.
Homework Equations
I have two (seemed to be) logical answers for this question, but with different values
how to resolve this, there must be at least one wrong answer
i need a resolution [/B]
The Attempt at a Solution
Solution 1
Solution 2