$=\frac{h}{p}=\frac{h}{mv},y_m=\frac{mL}{d},m=0,1,2,3,$dots

De Broglic wavelength for a moving particle

Positions of bright fringes for

double$-$slit interference at screen distance $L.$

A beam of electrons, and then a beam of protons, are shot through a double slit with a very small slit spacing such they make similar interference patterns. Which is true?

A$.$ The electrons must be traveling slower.

B$.$ The protons must be traveling slower.

C$.$ Only electrons can make an interference pattern on a screen.

D$.$ Neither makes an interference pattern.