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Sagot :
You will have none left because a half life is half of the time it takes to decompose. If the total time is double the half life, it will have completely decomposed by the end of the total time.
Answer:
16 gram
explanation:
times it ionises/decays = [tex]\frac{4}{2}[/tex] = 2 times
we will divide by 2, two times, because it decays two times.
Left after 4 hours: 64 ÷ 2 ÷ 2 = 16 gram
OR
By using the formula: [tex]\frac{m}{2^{n} }[/tex] .....where m is the mass and n is times it decays.
times it decays: 4 ÷ 2 = 2 times
Left after ionising: [tex]\frac{64}{2^2}[/tex] = 16 gram.
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