What fraction of a sample of 6832Ge, whose half-life is about 9 months, will remain after 2.1 yr ?
What fraction of a sample of 6832Ge, whose half-life is about 9 months, will remain after...
Fluorine-21 has a half-life of approximately 5 seconds. What fraction of original nuclei would remain after 1 minute?
A) A radioactive material produces 1220 decays per minute at one time, and 4.2 h later produces 150 decays per minute. What is its half-life? B) What fraction of a sample of 6832Ge, whose half-life is about 9 months, will remain after 3.5 yr ? C) What is the activity of a sample of 146C that contains 7.0×1020 nuclei? The half-life of 146C is 5700 years.
the half-life of Sr-90 is 29 years. what fraction if the atoms in a sample Sr-90 would remain 175 years later?
C-11 has a half-life of 20.3 minutes. What percentage of a C-11 sample will remain after 1 hour?
13) Fluorine-21 has a half-life of approximately 5 seconds. What fraction of original nuclei would remain after 1 minute? (6 points)
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.
A radioactive sample has a half-life of 10 minutes. What fraction of the sample is left after 40 minutes ? 1/2 1/4 1/8 1/16 Which one is correct ?
Problem 11: Beryllium-7 has a half-life of 53.1 days. What fraction of the nuclei in a beryllium sample will remain after 225 days? [If it will help, you can assume that 109 nuclei are present at the start] (6)
If C14 has a half-life of 4,000 years, what fraction will be remaining after 36,000 years? IfI 131 has a half-life of 8 days, what fraction will be left after a year?
+ 1/4 points Previous Answers SerCP11 29.3.P.020. My N Tritium has a half-life of 12.33 years. What fraction of the nuclei in a tritium sample will remain after the following periods of time? (a) 4.60 yr (b) 10.9 yr (c) 123.3 yr