The diagram shows two bar magnets. They are cut along the dashed line, and then the two marked ends are placed near each other.

Two bar magnet horizontal. The top has the north pole left and the south pole right. The magnet below is reversed. There is a red line from the center of the top one to the south pole of the bottom one.
Which statement best explains how the pieces will react?

The pieces will repel because the cut end of the top magnet is not a magnetic pole.
The pieces will attract because the cut end of the top magnet is not a magnetic pole.
The pieces will repel because the cut end of the top magnet is a south pole.
The pieces will attract because the cut end of the top magnet is a north pole.

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 will the system respond to a temperature increase?

Awave that is traveling fast can be said to have a high a. frequency b. speed c. wavelength d. amplitude e. period f. none of these