Question

An electron has a wavelength of 239 nm. Find its momentum. Planck’s constant is 6.63*10^-34?

Answer 1

λ = h/p

There are three symbols in this equation:

a) λ stands for the wavelength of the particle
b) h stands for Planck's Constant
c) p stands for the momentum of the particle

λ = 239 x `10^-9` m
h = 6.63 x `10^-34` kg `m^2` `s^-1`
p = h / λ

p = 6.63 x `10^-34` kg `m^2` `s^-1` / 239 x `10^-9` m

p = 0.0277 x `10^ -25` kg m `s^-1`