How much energy will a photon with a frequency of 6.8 x

10^4 Hz emit?

Give more examples of this type of heat transfer:

Scientist think that animals with remarkably similar embryo development probably shared a common ancestor

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 300j of energy to the room?unit: