16. A 670 nm monochromatic light beam passes through a double slit. On a screen 85 cm away, an interference pattern is observed. The average distance between the first two maxima and the center maximum is measured to be 3.8 mm. What is the width between the slits on the double slit

Two conductors, a and b, are each in the shape of a tetrahedron. but of different sizes. they are charged in the following manner: 1. tetrahedron a is charged from an electrostatic generator to charge q. 2. tetrahedron a is briefly touched to tetrahedron b. 3. steps 1 and 2 are repeated until the charge on tetrahedron b reaches a maximum value. if the charge on tetrahedron b was q/4 after the first time it touched tetrahedron a. what is the final charge qbmax on tetrahedron b?