## de broglie post module q 34 [ENDORSED]

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

Karina Koo 2H
Posts: 49
Joined: Fri Sep 28, 2018 12:24 am

### de broglie post module q 34

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?

Netpheel Wang 4L
Posts: 60
Joined: Fri Sep 28, 2018 12:15 am

### Re: de broglie post module q 34  [ENDORSED]

You would use the DeBroglie equation rearranged to $v = \frac{h}{\lambda m}$

Where v=velocity
Planck's Constant, h=6.626x10^-34
m=mass

You can tell if it is reasonable if the velocity is faster than the speed of light or not