On a guitar string fixed at both ends the fundamental frequency is 100hz. If the string is 1m long what’s the speed of the waves on the string? 50m/s
400m/s
100m/s
200m/s

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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no

explanation:

no i dont know how to solve this you should probably try to google the answer

umm its a tricky question