It will take 267 milliseconds for a sample of radon-218 to decay from 99 grams to 0. 50 grams.
We know that half life of a first order reaction is given by: 
where k = rate of reaction
Given half life = 35 milliseconds
So from this we get k = 0.0198
Now we know that rate of first order reaction is given by: 
where t= time
R'= initial amount = 99 g
R= final amount= 0.50 g
k= rate of reaction = 0.0198
Putting values of these in above equation we get t=267 milliseconds.
i.e. It will take 267 milliseconds for a sample of radon-218 to decay from 99 grams to 0. 50 grams.
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Answer:
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A weally works when you pull something and a axle is something that you can push
Explanation:
I hope this helps
Answer:
An atomic nucleus is positively charged because it is composed of protons.
Explanation:
Protons are positively charged
Neutrons are neutral
Electrons are negatively charged
A ship sailing away from you gradually goes out of sight,
starting from the bottom and moving up the sides of the ship.
The Earth is a sphere. As the ship gets farther away from
you, it's working its way around the curve of the sphere.
Since you can't see around the curve of the Earth, the
lowest point on the ship that you can see moves slowly
up the ship.
