1. The problem statement, all variables and given/known data What is the De Broglie wavelength of an electron with KE= 8.5 eV? 2. Relevant equations λ=h/p KE=0.5mv2 p=mv 3. The attempt at a solution I converted 8.5 eV into joules: 8/5 eV × 1.602e-19 J = 1.3617e-18 Then used it for KE to solve for v: I got 1729006.11 Used v to get p: 9.11e-31 × 1729006.11 = 1.575e-24 Used p to get λ: 6.63e-34/1.575e-24 And received λ= 4.209e-10 The answer required is on the order of picometers, and when I convert it to pm the answer is wrong. Entering it as it is also comes up wrong. Sorry I use excessive sigfigs, my homework is through the Connect system for my textbook and there is a VERY SMALL margin of error so you always have to keep a bunch of extra or the answer might come up as wrong if you round too early.