In a double slit experiment, there is a screen coated with a special material such that a tiny dot appears when a photon collides with it. You have a light source that can emit individual photons, one at a time. A single photon is emitted from the source, passes through the double slit, and strikes the screen, leaving a dot on the screen. As more photons are emitted, making more dots on the screen, you notice that the dots appear in a pattern. What pattern do the dots make

The base of a 50-meter tower is at the origin; the base of a 50-meter tree is at (0, 50, 0). the ground is flat and the z-axis points upward. the following parametric equations describe the motion of six projectiles each launched at time t = 0 in seconds. (i) r (t) = (50 + t2)k (ii) r (t) = 2t2 j + 2t2k (iii) r (t) = 50 i + 50 j + (50 − t2)k (iv) r (t) = 2t j + (50 − t2)k (v) r (t) = (50 − 2t) i + 2t j + (50 − t)k (vi) r (t) = t i + t j + tk (a) which projectile is launched from the top of the tower and goes downward? at time t = , the projectile hits the ground at point (x, y, z) = . (b) which projectile hits the top of the tree?