A500g sample of potassium-40 is left to decay radioactively. after 3.9x10^9 years, about how many grams of potassium-40 are expected to remain?

ice to water 1 water to vapour 2 latent heat

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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r = ρ x length / area  

ρ = r x area / length  

ρ is in ohm-meters  

in basic units, it is m³kg/s³a²  

i think this is it.

false.

explanation:

this statement is false. after falling for 5 seconds, its speed will not be 100 m/s.