Half-life calculations
10th grade (Year 11 in England) · 16 questions · Common Core: NGSS.HS-PS1-8, NGSS.SEP 5 · England: GCSE Combined Science: Atomic structure (radioactivity) (half-lives)
Name
Date
Score/ 16
Question 1
A sample has an activity of 3200 Bq. Its half-life is 12 minutes. What is its activity after 48 minutes, in Bq?
AnswerBq
Question 2
The count rate of a radioactive source falls from 640 counts/min to 320 counts/min in 4 minutes. What is its half-life, in minutes?
Answermin
Question 3
A sample contains 1600 undecayed nuclei. How many remain undecayed after 2 half-lives?
Answer
Question 4
A sample has an activity of 3200 Bq. Its half-life is 12 minutes. What is its activity after 24 minutes, in Bq?
AnswerBq
Question 5
The count rate of a radioactive source falls from 640 counts/min to 160 counts/min in 30 minutes. What is its half-life, in minutes?
Answermin
Question 6
A sample contains 3200 undecayed nuclei. How many remain undecayed after 3 half-lives?
Answer
Question 7
A sample has an activity of 800 Bq. Its half-life is 2 hours. What is its activity after 2 hours, in Bq?
AnswerBq
Question 8
The count rate of a radioactive source falls from 960 counts/min to 480 counts/min in 8 minutes. What is its half-life, in minutes?
Answermin
Question 9
A sample contains 800 undecayed nuclei. How many remain undecayed after 1 half-life?
Answer
Question 10
A sample has an activity of 400 Bq. Its half-life is 30 minutes. What is its activity after 30 minutes, in Bq?
AnswerBq
Question 11
The count rate of a radioactive source falls from 960 counts/min to 120 counts/min in 15 minutes. What is its half-life, in minutes?
Answermin
Question 12
A sample contains 800 undecayed nuclei. How many remain undecayed after 2 half-lives?
Answer
Question 13
A sample has an activity of 2000 Bq. Its half-life is 30 days. What is its activity after 30 days, in Bq?
AnswerBq
Question 14
The count rate of a radioactive source falls from 640 counts/min to 160 counts/min in 8 minutes. What is its half-life, in minutes?
Answermin
Question 15
A sample contains 3200 undecayed nuclei. How many remain undecayed after 3 half-lives?
Answer
Question 16
A sample has an activity of 3200 Bq. Its half-life is 8 minutes. What is its activity after 24 minutes, in Bq?
AnswerBq
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