Question

in which one of the following energy sources is the production of electricity due to the ejection of electrons by photons striking a light - sensitive material?
○ passive solar energy
○ photovoltaic cells
○ earth energy
○ nuclear fission
question 6 (1 point)
which of the following sources of energy includes a heat pump (as in air conditioners and refrigerators) to extract thermal energy?
○ a geothermal power plant
○ a passive solar energy system
○ an earth energy system
○ a nuclear power plant

Explanation:

1. Photovoltaic cells rely on the photoelectric effect, where photons strike a light-sensitive material to eject electrons and generate electricity.
2. Earth energy systems use heat pumps (similar to those in ACs/refrigerators) to extract thermal energy from the ground or air for heating/cooling/electricity production. Geothermal plants use underground heat directly without this type of heat pump, passive solar uses sunlight without pumps, and nuclear plants use fission heat.

Answer:

1. photovoltaic cells
2. an earth energy system