Answer to Question #150914 in General Chemistry for Lyna Moinifar

Question

What is the de Broglie wavelength (in kilometers) of an electron (mass = 9.109e-31 kg) traveling with a velocity of 5.386e+7 m/s?

Answer 1

For wavelength to be in km, the units of velocity should be turned into km/s:

v=5.386•10⁴km/s.

L(here the Greek letter lambda should be)=h/p =h/mv =6.626•10^-34/9.209•10^-31×5.386•10⁴=1.351•10^-8(km).