Electron wavelength question, college chem., help please!!?

The electron microscope has been widely used to obtain highly magnified images of biological and other types of materials. When an electron is accelerated through a particular potential field, it attains a speed of 5.50 x 106 m/s. The m of the electron is 9.11 x 10-31 kg. Planck's constant has the value h = 6.63 x 10-34 J-s. What is the characteristic wavelength of this electron?