A town is considering building a biodiesel power plant that would burn biomass to generate electricity. Which of the
following correctly lists an advantage and a disadvantage of this project?

a) Advantage: it could help get rid of unwanted waste. Disadvantage: there is no way to use the electricity created.

b) Advantage: it reduces dependence on fossil fuels. Disadvantage: it would emit pollution into the air.

c) Advantage: it is a commonly used energy source. Disadvantage: building the plant would attract new people to
the area.

d) Advantage: it would use energy from the sun and wind. Disadvantage: it is a non-renewable source of energy.

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.

Explain why electric current cannot exist if a current doesn't have a voltage source.

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?