What is the de broglie wavelength of an electron traveling at 1.34*105 m/s?

To solve this problem, we make use of the formula:

λ = h/mv

where:

λ = wavelength of electron

m = mass of electron = 9.11e-31 kg

v = speed of electron = 1.34*10^5 m/s

h = constant

Hence,

λ = (6.626x10^-34 J-s) / [ (9.11e-31 kg) (1.34 x 10^5 m/s) ]

λ = 5.43x10^-9 m or 5.43 nm