Question

How fast is an electron moving if it has a wavelength equal to the distance it travels in one second?

• A.
• B.
• C.
• D.

Answer 1

The correct option is C

$\lambda =\frac{h}{mv}butv=\lambda ,\lambda v=v^2=\frac{h}{m}orv=(\frac{h}{m}{)}^{\frac{1}{2}}$