Which factor will not affect the speed of sound? (size of the medium) or (elasticity of the medium)

coil wire, increase current, put iron inside the coil

1 - wave length

2 - amplitude

3 - crest

4 - trough

explanation:

duh.

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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