Coherent light with wavelength 599 nm passes through two very narrow slits with separation of 20 μm, and the interference pattern is observed on a screen located at a distance of 3.0 m from the slits. where will the second order dark fringe above the center of central bright fringe will form?

Aball is thrown from the top of a building with an initial velocity of 21.9 m/s straight upward, at an initial height of 51.6 m above the ground. the ball just misses the edge of the roof on its way down, as shown in the figure. (a) determine the time needed for the ball to reach its maximum height. (b) determine the maximum height. (c) determine the time needed for the ball to return to the height from which it was thrown, and the velocity of the ball at that instant. (d) determine the time needed for the ball to reach the ground. (e) determine the velocity and position of the ball at t = 5.35 s.