Ossih Posted May 6, 2015 Report Share Posted May 6, 2015 Hey guys, I was doing a multiple choice question with de broglie wavelength and mass. In short, I know that lambda = h/square root(2meV) for an electron, and so that implies that lambda is inversely proportional to the square root of m, which is the answer, and is what I chose. The derivation is straightforward for this formula, its using lambda = h/p, replacing p as square root of 2m * Ek which is 2meV. However, my friend did lambda = h/p and p = mv, which implies that lambda = h/mv and so lambda is inversely proportional to v. I know that the first one is right but why is the second one wrong Mathematically, it makes sense to me. Reply Link to post Share on other sites More sharing options...
Ossih Posted May 6, 2015 Author Report Share Posted May 6, 2015 Wait nvm I got it, it was the fact that the question said the kinetic energy was constant 1 Reply Link to post Share on other sites More sharing options...
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