9 Answered Questions for the topic Half-life

07/27/21

Half-life of silicon if 50 grams are present how many in 500 years
the half-life of silicon-32 is 710 years. if 50 grams are present now how much will be present in 500 years?
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Half Life Chemistry

06/02/20

5.0 mg of nobelium-253 was moved out of the reactor. It took 291 sec. to get the sample from the reactor to the lab. How many mg of nobelium-253 remained upon arrival to the lab? 1/2-life = 97 sec.

(Please help, thank you!)
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Half Life Chemistry

06/02/20

How many grams of a californium-254 will remain after 363 days if we start with 64.0 grams of this substance? The half-life of californium-254 is 60.5 days. (Please help, thank you!)
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Half Life Chemistry

06/02/20

An isotope of cesium-137 has a half-life of 30 years. If 5.0 g of cesium-137 decays over 60 years, how many grams will remain? (Please help, thank you!) 
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10/30/19

Finding exponential decay given half-life problem
The half-life of a certain radioactive substance is 10 years. Initially there are 100 grams of the substance. Let A(t) be the number of grams of the substance at time t years. Find each of the... more
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03/03/19

What is the decay rate of iodine 125 with a half life of 60.1 days?
The book asks us to use the equationE= ∫0a P0 e-kt dt. (integral from 0 to a)Where k is the decay constant for the radioactive material, a is the number of years since the implant, and P0 is the... more
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11/03/18

If the half-life of a radioactive substance is 86 hours, to the nearest hour, when will 85% of the substance have disappeared?
Hello! I am having trouble answering and understanding this math problem. I would appreciate the help!
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12/15/14

determine the amount present after 54 minutes and after 2 hours. when will the amount present be less than 2 kg
The radioactive isotope U-24 has a half-life of 18 minutes. If there's presently 150kg of U-24: determine the amount present after 54 minutes and after 2 hours. when will the amount present be less... more
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Half Life

12/13/14

Half-life question
It is observed that the activity of the radioactive element decreases exponentially according to the formula A(t) = A(10)^-kt, and decreases to 0.35 of its original quantity in 5h. Find the... more
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