Question #0ff3e

1 Answer
Sep 28, 2016

Answer:

#"2 days"#

Explanation:

A radioactive isotope's nuclear half-life tells you how much time must pass in order for half of the atoms present in a sample to undergo radioactive decay.

My own work

In your case, you start with #"10 g"# of a radioactive substance. Two days after first interacting with the sample, you find that its mass decreased to #"5 g"#.

This is, of course, equivalent to saying that #"5 g"# of the substance decayed. Since it took #2# days for half of the sample to undergo radioactive decay, you can say that this radioactive isotope has a half-life of #2# days.