The density of matter (primarily hydrogen atoms) in intergalactic space is such that its contribution to the pressure is of the order of 23 a) what is the approtinate density of mate in amm') in intergalactic approximate density of matter (in atoms/m3) in intergalactic space? b) what is the ratio of the kinetic energy of matter to the energy of radiation in intergalactic space? (recall problems 3.6-1 and 3.6-2.) c) what is the ratio of the total matter energy (i. e., the sum of the kinetic energy plus the relativistic energy mc2) to the energy of radiation in intergalactic space?

What challenges did you encounter during the circuit training program?

Oxygen and nutrients are moved through the body by the: a. circulatory system c. lymphatic system b. digestive system d. reproductive system

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.