➷ After 10,000 years the mass will be:
1,000 / 2 = 500
After 20,000 years the mass will be:
500/2 = 250
As you can see, the correct answer would be A. 20,000 years
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Answer:
A). [tex]t = 20,000 years[/tex]
Explanation:
Half life is the total time after which the substance will decay and remains only half of the initial amount
So here we will say that
initial amount is 1000 gram
Now after one half life only half of the amount will remain
so it is
[tex]m_1 = 1000/2 = 500 gram[/tex]
now again after another half life it will remain half of the initial amount
so it is
[tex]m_2 = 500/2 = 250 gram[/tex]
so it took two half lives
[tex]t = 10,000 + 10,000[/tex]
[tex]t = 20,000 years[/tex]
