Question

Part A

What is the speed of an electron with a de Broglie wavelength of 0.17nm ?

Express your answer using two significant figures.

Part B

What is the speed of a proton with a de Broglie wavelength of 0.17nm ?

Express your answer using two significant figures.

Answer 1

De Broglie wavelength is given by

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

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

$V= \frac{h}{m\times \lambda }$

(A) for electron

h is planck constant h= 6.626