An electron of mass 9.1 x 10-31 kg moves with a speed of 107ms-1. Calculate the wavelength of the associates wave[h = 6.6 x 10-34Js]
-
A.
9.0 x 10-24m -
B.
4.55 x 10-17m -
C.
7.25 x 10-11m -
D.
6.20 x 10-8m
Correct Answer: Option C
Explanation
(lambda = frac{hc}{frac{1}{2}mv^2})
= (frac{6.6 x 10^{-34} times 3 times 10^8}{0.5 times 9.1 times 10^{-3} (10^7)^2})
= 7.25 x 10-11m