An electron is traveling with a velocity of 2.78x10^5 m/s
A. What is it's wavelength?
B. What is it's frequency?
f = V / W, Where f=frequency, V=Velocity of the wave, W=wavelength of the wave.
W=h/p, where h=Planck's Constant, p=is the momentum of the particle.
p=m x v, m=mass of the body, v=the velocity of the particle.
From these 3 formulas, you should be able to calculate the wavelength and the frequency of the electron. You can look up the Planck's Constant.
