You are driving your car East at a speed of 30 m/s on a road along rail tracks. A train is moving West toward you at a speed of 10 m/s. The train blows its horn producing sound of frequency of 600 Hz. (vair = 343 m/s)
What frequency of the horn do you hear in [Hz]?
Suppose you pass the locomotive while the horn is still blowing. What frequency in [Hz] do you hear then?

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

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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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