A duck feels ocean waves pass under him 8 times every second. He notices the crests are 6.2 meters apart. What is
the speed of this wave? Give your answer to the nearrest
tenth.
m/s

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask

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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there are no atoms