Question

A radioactive isotope has a half-life of 3.0 hours. If a scientist has 30 grams of the isotope, how much is left after 15 hours?

Answer 1

Answer:

0.9375

Explanation:

3.0x30x15 = 17 496 000 kg $sx^{2}$

subtract or divde

then you take the 9 and 375 add 0.9000 and combine them and there you go.

                                                          $+\frac{0.9000}{375} =0.9375$