6) challenge problem: in searching the bottom of a pool at night, a

watchman shines a narrow beam of light from the flashlight, 1.3 m above the

water level, onto the surface of the water at a point 2.5 m from his foot at the

edge of the pool. where does the spot of light hit the bottom of the pool,

measured from the bottom of the wall beneath his foot, if the pool is 2.1 m deep?

Some material consisting of a collection of microscopic objects is kept at a high temperature. a photon detector capable of detecting photon energies from infrared through ultraviolet observes photons emitted with energies of 0.3 ev, 0.5 ev, 0.8 ev, 2.0ev, 2.5ev, and 2.8ev. these are the only photon energies observed. (a) draw and label a possible energy-level diagram for one of the microscopic objects, which has four bound states. on the diagram, indicate the transitions corresponding to the emitted photons. explain briefly. (b) would a spring–mass model be a good model for these microscopic objects? why or why not? (c) the material is now cooled down to a very low temperature, and the photon detector stops detecting photon emissions. next, a beam of light with a continuous range of energies from infrared through ultraviolet shines on the material, and the photon detector observes the beam of light after it passes through the material. what photon energies in this beam of light are observed to be significantly reduced in intensity (“dark absorption lines”)? explain briefly.

How do we measure or think of speed in the united states?

What word chemical equation describes cavendish’s experiment with zinc?