Henry can lift a 200 n load 20 m up a ladder in 40 s. ricardo can lift twice the load up one-half the distance in the same amount of time. which comparison between ricardo and henry is correct? a. ricardo exerted a greater force, did the same amount of work, and had the same power output as henry. b. ricardo exerted a greater force, did the same amount of work, and had a greater power output than henry. c. ricardo exerted a greater force, did less work, and had a lower power output than henry. d. ricardo exerted a smaller force, did more work, and had the same power output as henry.

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.