For 1 gram of radioactive material that has a half-life of one year, after 4 years the original radioactive material left will be
A) 0 g.
B) 1/2 g.
C) 1/4 g.
D) 1/8 g.
E) none of the above
Question 2
For an isotope with a half-life of one day, at the end of two days the amount that remains is
A) none.
B) one-half.
C) one-quarter.
D) one-eighth.
E) none of the above