PH-2109
Half-life
Physics · Secondary 4 · Medium · Half-life
A hospital uses a radioactive tracer with a half-life of 4.0 hours. The activity of the tracer when injected is 1600 counts/min. What is its activity 8.0 hours later?
- 200 counts/min
- 400 counts/min
- 800 counts/min
- 3200 counts/min
Sign in to check your answer and see the hint and the worked explanation. Free on PrepLab High.