PH-2077
Background radiation
Physics · Secondary 4 · Medium · Background radiation
A sample of radioactive material has an initial count rate of 600 counts per minute. The background count rate is 40 counts per minute. After some time, the measured count rate is 340 counts per minute. What is the count rate due to the radioactive sample only at this time?
- 300 counts per minute
- 260 counts per minute
- 340 counts per minute
- 560 counts per minute
Sign in to check your answer and see the hint and the worked explanation. Free on PrepLab High.