In an attempt to compare the half-lives
of two radioactive elements, x and y, a
scientist set aside 400g of each. after 6
months, the scientist found that 25g of x
and 200g of y remained. which of the
following statements is true?
a. the half-life of y is twice the half-life
of x.
b. the half-life of y is four times the
half-life of x.
c. the half-life of y is eight times the
half-life of x
d. unless the exact time interval is
established, a comparison cannot be
made.