Which of the following is a method for the generation of current electricity. a. hydro-electric generation
b. thermal generation
c. tidal generation
d. all of the above

While standing outdoors one evening, you are exposed to the following four types of electromagnetic radiation: yellow light from a sodium street lamp, radio waves from an am radio station, radio waves from an fm radio station, and microwaves from an antenna of a communications system. rank these type of waves in terms of increasing photon energy.