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During the first half-life you lose half of the radioactive material; during the second half life...
a radioactive material has a half life of 7 days. how many radioactive isotopes are left after 33 hours, if you had 7000000 isotopes in the beginning? Question 33 1 pts A radioactive material has a half life of 7 days. How many radioactive isotopes are left after 33 hours, if you had 7 000 000 isotopes in the beginning? Use 2 sig figs in your answer. < Previous Next >
The radioactive half-life of a material is the time for Select one: a. half of an original quantity of the material to decay. b. its decay rate to reduce to half. c. both of these d. neither of these
A radioactive isotope decays by B" emission with a half-life of 1.0 min. During the first 1.0 min, a particular sample emits 1000 B particles. During the next 1.0 min, the number of B- particles this sample will emit will be closest to 250. 500. O 1000. 1500. 2000.
please help with the following Half-Life and Activity: 4 g of radioactive material of half-life period 10 years is kept in store for 15 years. How much of material is disintegrated?
91. If the half – life of a sample of radioactive material is 60 days, what fraction of the original radioactive nuclei will remain after 120 days.
the half life for radioactive decay (a first order process) of plutonium- 239 is 240,000 years. How many years does it take for one mole of this radioactive material decay until just one atom remains?
A 175 ng sample of radioactive material has a half life of 8.8 days. How many ng of radioactive material is left after 3 half lives? Do not put units in your answer
After 70 years, 40 % of a radioactive material decays. What is the half-life?
(Can you show work for these questions) If a radioactive material decomposes with a half-life of 2 days, how much of a 16- gram sample will remain after 10 days? A. 4.0 grams B. 2.0 grams C. 1.0 grams D. 0.5 grams If 2.5 grams of a radioactive isotope exist after 30 days in a storage vial, how much was present when it was sealed if the t1/2 = 6 days? A. 80 grams B. 60 grams C. 40 grams...
Radioactive Decay - Half-life and Activity 1 Radioactive decay - Half-life Time 0 1000 21 31 750 N 1.000.000 500,000 250,000 125,000 62,500 31.250 15.625 7813 3.506 1.953 977 51 6 500 7 BI . 101 250 125 0 tie 21.234.41516171819, 1012 Time in multiples of A radioactive sample's half-life is 30.2 years. 1 year = 365 days, 1 day = 24 hours, 1 hour - 60 minutes, 1 minute = 60 seconds (a) Find its decay constant in year...