The decay constant of a radioactive substance is 6.93*10-2 min ^-1 . The time (in minutes) taken between 12 % decay and 56 % decay of the same radioactive substance is?

^3H decays to ^3He (Helium) with a half life of 12.32 years. If you start off with 1,000,000 atoms of ^3H how many years will it take for the number of ^3H atoms to reach 125,000?

The concentration of carbon-14 in living plants is about 240 Bq/kg C. If a tree dies today, what concentration of carbon-14 would still be present after 2 half-lives? О 240 Вq/kg с 120 Bq/kg C О 60 Вg/kg C O none

[References] Use the References to access important values if needed for this question. Radioactive decay can be described by the following equation In A = In Ag - kt where Ag is the original amount of the substance, A is the amount of the substance remaining after time t, and k is a constant that is characteristic of the substance. For the radioactive isotope chromium-51, k is 2.50 x 10-2 days . If the original amount of chromium-51 in a sample is 29.2 mg, how much chromium-51 remains after 30.5 days have passed? mg Submit Answer Retry Entire Group No more group attempts remain