marissagirl4903
26.06.2019 •
Chemistry
This chart show the amount of radioactivity measured from three unknown isotopes. which statement describes each of the isotopes? isotope a was measured at day 24, isotope b was measured at day 6, and isotope c was measured at day 10. isotope a was measured at day 18, isotope b was measured at day 4, and isotope c was measured at day 5. isotope a was measured at day 24, isotope b was measured at day 8, and isotope c was measured at day 20. isotope a was measured at day 30, isotope b was measured at day 6, and isotope c was measured at day 10.
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Ответ:
Isotope A was measured at day 24, Isotope B was measured at day 6, and Isotope C was measured at day 10.
Explanation:
The half-life time is defined as the time needed for the radioactive isotope to decay to the half of its initial concentration.
Isotope A: its starting weight 95 g and its ending measured weight is 5.9.95 → 47.5 (half-life 1) → 23.75 (half-life 2) → 11.875 (half-life 3) → 5.9 (half-life 4).
It needs 4 half-lives to decay from 95 to 5.9.
half-life time of isotope A = 6 days.
the time taken to measure isotope A = (4 x 6 days) = 24 days.
Isotope B: its starting weight 20 g and its ending measured weight is 2.5.20 → 10 (half-life 1) → 5 (half-life 2) → 2.5 (half-life 3).
It needs 3 half-lives to decay from 20 to 2.5.
half-life time of isotope B = 2 days.
the time taken to measure isotope B = (3 x 2 days) = 6 days.
Isotope C: its starting weight 45 g and its ending measured weight is 22.5.45 → 22.5 (half-life 1)
It needs 1 half-life to decay from 45 to 22.5.
half-life time of isotope C = 10 days.
the time taken to measure isotope C = (1 x 10 days) = 10 days.
Ответ:
B but there might be more, look below. I didn't have time to calculate the other answers.
Step-by-step explanation:
Well, it is growing x3 each hour, so each half hour it's 1.5...
So whichever is equal to 1.5 is the answer, like B. There might be more.