A beam of electrons is directed along the x axis and through a slit that is parallel

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A beam of electrons is directed along the x axis and through a slit that is parallel to the y axis and 10 mm wide. The electrons then continue on to a screen 1.5 m away. The electrons in the beam have a kinetic energy of 70 eV. 

(a) What is the de Broglie wavelength of the electrons? 

(b) What is the uncertainty in the y component of their momentum after passing through the slit? 

(c) How long does it take the electrons to reach the screen? 

(d) What is the uncertainty in the y position when they hit the screen?

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