When metallic sodium is dissolved in liquid sodium chloride, electrons are released into the liquid. these dissolved electrons absorb light with a wavelength near 800 nm. suppose we treat the positive ions surrounding an electron very crudely as defining a three-dimensional cubic box of edge l, and we assume that the absorbed light excites the electron from its ground state to the first excited state. calculate the edge length l within this simple model.

To find the work done, the force exerted and distance moved are multiplied. a couch is moved twice before you are happy with its placement. the same force was used to move the couch both times. if more work is done the first time it is moved, what do you know about the distance it was moved? a) when more work was done, the couch was moved the same distance. b) when more work was done, the couch was moved less. c) when more work was done, the couch was moved further. d) when more work was done, the couch wasn't moved at all.