n a demonstration of the double slit experiment, a high velocity stream of dense shperes is fired at a slit, and another stream is fired as an adjacent identical slit. For each stream, all spheres pass straight through the slit, then hit the same location on a screen. Next, two streams are fired at two slits next to one another. On a screen beyond the slits, a diffration pattern is formed. Which does classica nmechanics explain, and which situation does quantum mechanic explain