The count rate detected from a radioactive source reduces from $4000$ counts per minute to $500$ counts per minute in $72$ minutes. What is the half-life of the source?
- A8 minutes
- B9 minutes
- C18 minutes
- D24 minutes
Physics 5054 · O Level · Half-life
Physics 5054 · O Level · Half-life
The count rate detected from a radioactive source reduces from $4000$ counts per minute to $500$ counts per minute in $72$ minutes. What is the half-life of the source?