A copper rod and an aluminum rod of equal diameter are joined end to end in good thermal contact. The temperature of the free end of the copper rod is held at constant at 150.0C and the far end of the aluminum is held at 30.0C. If the copper rod is 20.0 cm long, what must the length of the aluminum rod be so that the temperature of the junction is 100.0C? (Hint: the heat transfer rate is the same across both)

more than, less

less than, more

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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