An isotope has a half-life of 20.37 days. What is its decay constant in units of s-1?
An isotope has a half-life of 20.37 days. What is its decay constant in units of...
1. a certain isotope has a half life of 24.3 minutes. what is the decay constant (in s^-1) of this isotope? 2. You are told that a room contains an isotope with a half-life of 1.5 hours. If you need to wait until the isotope has decayed to 15% of its initial activity before entering the room, how long (in hours) must you wait
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
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 isotope 143Pr undergoes beta decay with a half-life of 13.57 days. What fraction of 143Pr has decayed after 11.6 days?
CH 20 Half-Lives Question What is the half-life of ;, in days, if its decay constant is 9.94 x 10-75-11 Select the correct answer below: O 10.1 days O 8.07 days O 6.90 x 105 days 02.84 days
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 rate constant for the decay of a radioactive isotope is 4.226 x 10-3/day. What is the half-life of of this isotope? 328.0 days O 410.0 days O 82.00 days O 164.0 days O none of these
The half-life of a radioactive isotope is 220 d. How many days would it take for the decay rate of a sample of this isotope to fall to 0.47 of its initial rate?
The isotope 208^Tl undergoes β decay with a half-life of 3.1 min. (a) What isotope is produced by the decay? (b) How long will it take for 99.0% of a sample of pure 208Tl to decay? (c) What percentage of a sample of pure 208Tl remains un-decayed after 1.0 h?
1. The half-life of an isotope of phosphorus is 14.2 days. If a sample contains 3.96e16 such nuclei, determine its activity.? 2. A 234-mCi sample of a radioactive isotope is purchased by a medical supply house. If the sample has a half-life of 17.4 days, how long will it keep before its activity is reduced to 28.9 mCi?