At 0 degrees Celsius, a sound wave travels at 330 m/s in air. A distant horn is producing a note that has a frequency of 440 Hz. How long would that sound wave be? How long does it take a complete wave to pass you by? (That is, what is its period?)

frequency or wavelenth of em radiation in a vacuum

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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