Question
The half-life of a radioactive kind of nitrogen is 10 minutes. If you start with 120 grams of it, how much will be left after 20 minutes?
Answers
GPT 3.5
The half-life of a radioactive substance is the time it takes for half of the substance to decay. In this case, the half-life of nitrogen is 10 minutes.
After 10 minutes, half of the original amount of nitrogen will remain. So, after the first 10 minutes, there will be 120 grams / 2 = <<120/2=60>>60 grams of nitrogen left.
After another 10 minutes (a total of 20 minutes), there will be another half-life. So, half of the 60 grams remaining will decay, leaving 60 grams / 2 = <<60/2=30>>30 grams of nitrogen.
Therefore, after 20 minutes, 30 grams of nitrogen will be left.
After 10 minutes, half of the original amount of nitrogen will remain. So, after the first 10 minutes, there will be 120 grams / 2 = <<120/2=60>>60 grams of nitrogen left.
After another 10 minutes (a total of 20 minutes), there will be another half-life. So, half of the 60 grams remaining will decay, leaving 60 grams / 2 = <<60/2=30>>30 grams of nitrogen.
Therefore, after 20 minutes, 30 grams of nitrogen will be left.