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A The half-life of cobalt-60 is 5.20 yr. How many milligrams of a 2.000-mg sample remains...
QUESTION 18In balancing the nuclear reaction 238U =234X + alpha particle, the identity of element X is ___________.cannot determine from the information providedthaliumthoriumuraniumplutoniumQUESTION 19The decay of a radionuclide with a half-life of 4.3×105 years has a rate constant (in 1/years) equal to __________.6.2×1052.3×10-65.9×10-81.6×10-62.8×103QUESTION 20Radium was used to make glow-in-the-dark watches before it dawned on people that it may not be a good idea to put a strong radiation source on the public’s wrists. Suppose that your father (or grandfather) bought...
1) Cobalt – 60, with a half-life of 5 years, is used in cancer radiation treatments. If a hospital purchases a supply of 30.0 g, how much would be left after 15 years? ______________ 2)Iron-59 is used in medicine to diagnose blood circulation disorders. The half-life of iron-59 is 44.5 days. How much of a 2.000 mg sample will remain after 133.5 days? ______________ 3) The half-life of polonium-218 is 3.0 minutes. If you start with 20.0 g, how long...
The half life of cobalt 60 is 5.3 years. How long will it take a 4.8g sample of Co60 to decay until only 1.6g of Co60 remains in the sample?
70. The half-life of cobalt-60 is 5.3 years. What percent of a sample of cobal:-60 will remain after 21.2 years? A) 50% B) 40% C) 12.5% D) 10% E) 6.25%
Polonium-208 is an alpha emitter with a half-life of 2.90 years. How many milligrams of polonium from an original sample of 5.00 mg will remain after 8.00 years?
Cobalt-60 is radioactive and has a half life of 5.26 years. Calculate the activity of a 4.5 mg sample of cobalt-60. Give your answer in becquerels and in curies. Round your answer to 2 significant digits. Bq ? Ci
Calcium-47, used to evaluate bone metabolism, has a half-life of 4.5 days. How many milligrams of a 49-mg sample of calcium-47 remain after 54 days? Express your answer using two significant figures. mg
A 1.6 mg sample of radioactive Ho-166 has a half-life of 26.8 years. What mass remains after 12 years? All radioactive decay processes are 1st order reactions. t1/2 = 0.693/k ln [A]t = -kt + ln [A
TO A so-mg sample of iodine 131 was placed in a container 32.4 days ago. If its half-life is .I days, how many milligrams of iodine-131 are now present? A) 47.3 mg B) 3.1 mg C) 3.24 mg D) 0.8 mg E) 6.2 mg 11. What nuclear process involves heavy nuclei splitting into lighter nuck A) gamma decay B) beta decay C) breeding D) fission E) fusion 12. Ame ricium-241 is a radioactive isotope used in smoke detectors. If the...
The half-life of gallium-67 is 78.2 hours. How many milligrams of a 94.3 milligram sample of gallium-67 will be lost by radioactive decay during 235 hours?