Author Question: A radioactive isotope has a half-life of one week. At the end of two weeks the amount remaining is ... (Read 50 times)

bobypop · **on:** Jul 29, 2018

A radioactive isotope has a half-life of one week. At the end of two weeks the amount remaining is

1) none,
2) one-eighth,
3) one-quarter,
4) one-half,

and at the end of three weeks the amount remaining is
5) none.
6) one-eighth.
7) one-quarter.
8) one-half.

Question 2

Radioactive isotope A has a half-life of one year, while radioactive isotope B has a half-life of one day. If equal numbers of atoms of each are present, which will give the highest reading on a Geiger counter?

1) A
2) B
3) both the same

How much of the original sample of radioactive isotope A will be left at the end of the second year?
4) none
5) one-quarter
6) one-half
7) one-eighth