Only 2 questions 8 points

1. what might be a long-term benefit for the nation from space exploration?

a. taxes will be lower.
b. more people will be interested in studying science.
c. more science fiction movies will be made.
d. more people will become famous.

2. which of the following statements is true of space exploration?

a. space exploration is too expensive to be of any good to society.
b. space exploration has given society many technological advances.
c. space exploration is not based on science.
d. space exploration is too limited to benefit society.

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.