PH-2114
Half-life
Physics · Secondary 4 · Hard · Half-life
A radioactive sample has a count rate of 640 counts/min. After 12 minutes, the count rate falls to 160 counts/min. Assuming a constant half-life, what is the half-life of the sample?
- 6 min
- 3 min
- 12 min
- 24 min
Sign in to check your answer and see the hint and the worked explanation. Free on PrepLab High.