Of what material is a wire made, if it is 20.0 m long with a 0.150 mm diameter and has a resistance of 18.0 Ω at 20.0°C?

Silver (ρ=1.590431×10∧-8 Ωm )

Explanation:

Resistivity formula using diameter ρ =

Given: length(L)=20 m, diameter (d) =.150 mm=.150 ×10∧-3, Resistance (R)= 18 Ω

ρ =

= 0.01590431×10∧-6 Ωm

= 1.590431×10∧-8 Ohm meters (Electrical Resistivity of Silver at 20°C)

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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im srry but ur wrong the answer is d a smooth rock, some red dirt, and an empty bird's nest.