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CH 20 Half-Lives Question What is the half-life of ;, in days, if its decay constant...
An isotope has a half-life of 20.37 days. What is its decay constant in units of s-1?
1. The half-life of 2211Na is 950 days. What is its decay constant? Express your answer in s?1. 2.The isotope 8737Rb decays by beta emission. What nucleus is produced?
The half-life of radon-222 is 3.823 days. What is the rate (decay) constant of this isotope? (Report your answer in standard notation. Only include the number in the answer box.) k = ?????? day-1
What is the rate constant for the decay of Bi-210 if the isotope's half-life is 5.0 days? O A. 0.20 days? OB. 0.20 days O C. 0.14 days OD. 0.14 days?
The decay constant of a given nucleus is 4.9×10?5 s?1 . What is its half-life? Answer is in hours.
Question 8 What is the relationship between the rate constant and the half-life for nuclear decay? In (2) k = 1112 ok= ln (0.69311/2) rate = kt12 ok=0.693112 In (0.693) 11 12
The half-life of 131I is 8.04 days. (a) Convert the half-life to seconds. (b) Calculate the decay constant for this isotope. (c) Convert 0.350 μCi to the SI unit the becquerel. (d) Find the number of 131I nuclei necessary to produce a sample with an activity of 0.350 μCi. (e) Suppose the activity of a certain 131I sample is 6.10 mCi at a given time. Find the number of half-lives the sample goes through in 40.2 d and the activity...
The half-life of 52Mn is 5.59 days. (a) Convert the half-life to units of seconds. (b) What is the decay constant (in s−1) for this isotope? (c) Suppose a sample of 52Mn has an activity of 0.510 µCi. What is this activity expressed in the SI unit of becquerels (Bq)? (d) How many 52Mn nuclei are needed in the sample in part (c) to have the activity of 0.510 µCi? E. Now suppose that a new sample of 52Mn has...
The half-life of 131I is 8.04 days. (a) Convert the half-life to seconds. s (b) Calculate the decay constant for this isotope. s−1 (c) Convert 0.650 μCi to the SI unit the becquerel. Bq (d) Find the number of 131I nuclei necessary to produce a sample with an activity of 0.650 μCi. 131I nuclei (e) Suppose the activity of a certain 131I sample is 7.10 mCi at a given time. Find the number of half-lives the sample goes through in...
10) The half-life of lodine-131 is 8 days. The initial amount is 20 milligrams. a) Find a function which gives the amount of lodine-131, Act), in milligrams, t days later. Round k, the decay constant, to four decimal places. b) Determine the length of time it takes for 70% of the material to decay. Round your answer to two decimal places. Be sure to label the answer.