To what tension must you adjust the string so that, when vibrating in its second overtone, it produces sound of wavelength 0.766 m ? (Assume that the breaking stress of the wire is very large and isn’t exceeded.) T = select: 2863.14 N

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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