Question

You have 976 grams of a radioactive kind of rhodium. How much will be left after 120 seconds if its half-life is 30 seconds?
grams

Answer 1

488 grams

After 30 seconds: 488 grams remaining
After 60 seconds: 244 grams remaining
After 90 seconds: 122 grams remaining
After 120 seconds: 61 grams remaining

Therefore, after 120 seconds, there will be 488 grams of the radioactive rhodium remaining.