12th Grade Nuclear Radioactivity Quizzes, Questions & Answers

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Test Your Science Skills With The Nuclear Physics Quiz – Radioactivity

Ever found yourself zoning out in class when the topic turned to half-lives or alpha decay — only to realize you’d missed the part that actually makes it make sense? You’re not alone. The Nuclear Physics Quiz...

Questions: 10 | Attempts: 141 | Last updated: Oct 14, 2025

Sample Question 1
Which sample has the lowest initial decay rate

0.7 mole isotope with half life 4800 days

1.0 mole isotope with half life 400 days

0.001 mole isotope with half life 3.5 days

0.004 mole isotope with half life 10 days

Sample Question 2
Two nuclides X and Y are used. Initially the ratio X to Y is 2.50. After three days the ratio becomes 4.20. If Y has half life 1.60 days what is the half life of X

4.26 days

2.66 days

1.14 days

0.875 days

Sample Question 3
A graph of natural log of count rate versus time is a straight line from 3 at time zero to 0 at sixty seconds. Which expression fits the count rate

N equals 20 e to the power minus 0.05 t

N equals 3 e to the power minus 0.05 t

N equals 20 e to the power 20 t

N equals 1000 e to the power minus 20 t