## q 34

$\lambda=\frac{h}{p}$

805373590
Posts: 101
Joined: Wed Sep 11, 2019 12:17 am

### q 34

how do we determine is our answer is reasonable in "If an electron (mass 9.11 x 10-31 kg) has an associated wavelength of 7.28 x 10-9 m, what is its speed? Is your answer reasonable, why?'

Alice Chang 2H
Posts: 101
Joined: Fri Aug 30, 2019 12:18 am

### Re: q 34

Not sure if this is right, but from what I've found online, electrons can only move about 1% of the speed of light. The question's answer is around 4.12 x 10^16 m/s for the electron's speed, which is way faster than light (assuming I did the calculations correctly). So, I assume that this is unreasonable. Hope this helps somehow!