69. Two cars travel along a straight road. When a stopwatch reads t = 0.00 h, car A is at xa = 48.0 km moving at a
constant speed of 36.0 km/h. Later, when the watch
reads t = 0.50 h, car B is at Xp = 0.00 km moving at
48.0 km/h. Answer the following questions, first
graphically by creating a position-time graph and
then algebraically by writing equations for the posi-
tions xa and xp as a function of the stopwatch time (t).
a. What will the watch read when car B passes car A?
b. At what position will car B pass car A?
c. When the cars pass, how long will it have been
since car A was at the reference point?

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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.