Ask a New Question

Question

In 4 years, 30% of a radioactive element decays. Find its half-life. (Round your answer to one decimal place.)
_____ yr
11 years ago

Answers

Steve
(1/2)^(4/k) = 0.7
Now just solve for k.

Expect a number greater than 4, since if the half-life were 4, then 50% would decay in 4 years.
11 years ago
Dequan
In other words
(1/2)^([Years]/X)=[% remaining]
Solve for X
8 years ago

Related Questions

The amount A(gms) of radioactive plutonium remaining in a 20gm sample after t days is given by: A =... Q1) If there are 100 radioactive atoms with a half-life of 30 seconds, how many radioactive atoms wi... Look at the table of radioactive isotypes below. Isotype Type of Decay Uranium-238... If a 25 mg sample of radioactive material decays to 18.4 mg in 5 years, how long will it take the sa... 5. Cesium-137 is a radioactive isotope. The following formula represents the remaining amount of a... After the release of radioactive material into the atmosphere from a nuclear power plant in a countr... Every week, 2/5 of a radioactive substance remains from an initial amount of 150mg. How many mill... Question 50 ng of a radioactive isotope with a half-life of 23 seconds is expected to decay expon... What percentage of a radioactive species would be found as daughter material after five half-lives?... 10. A scientist uses radioactive isotopes to label a double-stranded molecule of DNA. Then the DNA u...
Ask a New Question
Archives Contact Us Privacy Policy Terms of Use