Answer to Question #115226 in Electricity and Magnetism for willaims

Question

Calculate the mass of a de Broglie’s particle traveling at a speed of 30m/s
with wavelength 1.49x10-26 nm:
A 0.43 x 10-3 kg.
B 0.15 kg.
C 0.35 x 10-3 kg.
D 0.96 kg.

Answer 1

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

$m=\frac{h}{v\lambda}$

$m=\frac{6.63\times10^{-34}}{30\times1.49\times10^{-26}\times10^{-9}}=0.148\times10=1.48kg$