Solve half-life problems
9th grade (Year 10 in England) · 16 questions · Common Core: HSF.LE.A.2, HSF.LE.B.5 · England: GCSE Higher Algebra
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Question 1
The half-life of a medicine in the blood is 4 hours. Starting with 96 mg, how much is left after 16 hours?
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Question 2
A 160 mg sample decays to 10 mg in 8 days. What is its half-life in days?
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Question 3
The half-life of a medicine in the blood is 4 hours. Starting with 6 mg, how much is left after 4 hours?
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Question 4
A 20 mg sample decays to 5 mg in 10 days. What is its half-life in days?
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Question 5
The half-life of caffeine in the body is 10 hours. Starting with 52 mg, how much is left after 20 hours?
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Question 6
A 128 mg sample decays to 16 mg in 18 days. What is its half-life in days?
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Question 7
The half-life of caffeine in the body is 8 hours. Starting with 160 mg, how much is left after 32 hours?
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Question 8
A 240 mg sample decays to 15 mg in 24 days. What is its half-life in days?
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Question 9
The half-life of caffeine in the body is 5 hours. Starting with 192 mg, how much is left after 15 hours?
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Question 10
A 448 mg sample decays to 14 mg in 45 days. What is its half-life in days?
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Question 11
The half-life of a medicine in the blood is 6 hours. Starting with 16 mg, how much is left after 12 hours?
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Question 12
A 384 mg sample decays to 12 mg in 40 days. What is its half-life in days?
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Question 13
The half-life of a radioactive sample is 7 hours. Starting with 416 g, how much is left after 35 hours?
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Question 14
A 120 mg sample decays to 15 mg in 18 days. What is its half-life in days?
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Question 15
The half-life of a medicine in the blood is 12 hours. Starting with 480 mg, how much is left after 60 hours?
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Question 16
A 68 mg sample decays to 17 mg in 6 days. What is its half-life in days?
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