Q. Coherent light with wavelength 595 nm passes through two very narrow slits, and the interference pattern is observed on a screen a distance of 3.00 {rm m} from the slits. The first-order bright fringe is a distance of 4.84 {rm mm} from the center of the central bright fringe. For what wavelength of light will the first-order dark fringe be observed at this same point on the screen?
Q. At t=0, a proton is moving with a speed of 5.1*10^5 m/s at an angle of 30 degrees from the x-axis. A magnetic field of magnitude 1.4 T is in the positive y direction. What will be the y coordinate of the proton 10 microseconds later?