A beam of protons is incident on a double slit that produces a diffraction pattern on a viewing screen. The screen is a distance of 3.18m3.18m from the double slits, the protons are traveling at a speed of 747m/s747m/s. The first maximum after the central maximum is a distance of 169m169m away from the central maximum. The mass of a proton is 938MeV/2938MeV/2.

What is the spacing between the double slits?