Which of the following is the correct definition of radiation?

a. the electromagnetic radiation from the surface of an object which is due to the object's temperature

b. the transmission of heat across matter

c. the transfer of heat by electrical currents

d. the transfer of heat by currents within a liquid or gas

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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