if-a-radioisotope-has-a-half-life-of-3-days-how-much-of-a-40g-sample-remains-aft

Question

If a radioisotope has a half-life of 3 days, how much of a 40g sample remains after 9 days?

Accepted Answer

5g

Answer

10g

Answer

2.5g

Answer

20g