The third harmonic of an organ pipe that is open at both ends and is 2.25 m long excites the fourth resonant frequency above the fundamental in another organ pipe. Determine the length of the other pipe when A) it is open at both ends and B) when it is open at one end and closed at the other. The temperature is unknown, therefore the speed of sound is unknown.

wire in brush may conduct electricity from cell to drill and vice versa electrc shock possible

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measure their densities same density, same sub

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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