Compare and contrast microwaves with visible light using wavelength, frequency and energy.

If a refrigerator is a heat pump that follows the first law of thermodynamics, how much heat was removed from food inside of the refrigerator if it released 380j of energy to the room?

Positrons are spontaneously emitted from the nuclei of

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration