Order the speed of sound through these materials from the slowest to the fastest.

speed of sound in cold air
speed of sound in hot molten lead
speed of sound in steel
speed of sound in warm air
speed of sound in water

1 ) Warm air

2) Cold air

3) Cold water

4) Steel

5) Hot molten

Explanation:

In order to solve this problem, we have to warn that the sound propagates more easily in denser media, in this way we have to identify the densities of the different materials.

Density cold air = 1.2 [kg/m^3]

Density warm air = 1.01 [kg/m^3]

Density cold water = 1000 [kg/m^3]

Density steel = 7500 [kg/m^3]

Density hot molten = 14100 [kg/m^3]

Therefore in order from the slowest to the fastest:

1 ) Warm air

2) Cold air

3) Cold water

4) Steel

5) Hot molten

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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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