Which observation provided albert einstein the clue that he needed to explain the photoelectric effect? a) light is made up of extremely small particles. b) particles that are emitted from a strip of metal are electrons. c) shining light on a metal strip produces emissions. d) energy of electrons depends on light’s frequency, not intensity.

To do work, this truck uses energy stored in chemical fuel and an electrical battery. how much total energy does this truck put out?

Do you agree with scientist’s prediction about the warming of alaska and other polar regions?

Because air contracts as it cools, the air pressure inside a freezer is typically lower than on the outside. why do ice cubes inside a freezer tend to shrink over time? a. the ice dissolves oxygen from the air, forming a denser crystalline matrix. b. the ice reacts chemically with carbon dioxide in the air, forming gaseous carbon compounds. c. the ice melts, and then the liquid freezes as ice crystals on the bottom of the freezer. d. the ice sublimes, and then the water vapor deposits as ice crystals on the sides of the freezer.