What fraction of a sample of neutrons will be left after 14.9 minutes?
What fraction of a sample of neutrons will be left after 14.9 minutes?
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 ?
A scientist begins with 250 grams of a radioactive substance. After 250 minutes, the sample has decayed to 36 grams. Write an exponential equation f(t) representing this situation. (Let f be the amount of radioactive substance in grams and t be the time in minutes.) f(t) 250e 0.0087t x To the nearest minute, what is the half-life of this substance? 89 min Use the model for continuous exponential decay, y = Ao e-kt, where y is the amount of radioactive...
What fraction of a sample of 6832Ge, whose half-life is about 9 months, will remain after 2.1 yr ?
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?
The half-life of "free" neutrons (those not bound inside a nucleus) is 10 minutes. Suppose that 100,000 neutrons are created in a reactor each second; they have β-0.8 and are directed toward an experimental target some distance Ax away. Detectors monitoring the target reveal that 60,000 neutrons arrive there per second. What is ΔΧ7(5 points) Do you think this problem is realistic? (3)
C-11 has a half-life of 20.3 minutes. What percentage of a C-11 sample will remain after 1 hour?
you are dying a sample of Ba3(PO4)2. after 5 minutes of drying it weighs 1.2034 g. you continue to dry the sample for another 5 minutes and now it weighs 1.9345 g. what is the percent change in mass?
A 100-mg sample of a radioactive isotope is obtained. After 33.5 minutes, only 3.10 mg remains. What is the half-life of the isotope? min
Question 4 1 pts A particular radioactive isotope has a half-life of 2.90 weeks. What fraction of the original sample is left after 101.5 days? 1/8 1/64 1/32 1/16 none of these Next
Polynomial Functions Tips on TIPS The population, P, of particles in a sample after t minutes can be modeled by the function: P(t) = 142 – 6t + 1300 a) Write an expression for the average rate of change of the population from t = 12 to t= 12 + h. b) Use your expression to determine the average rate of change of the population from t = 12 to t= 16. c) Use your expression to estimate the instantaneous...