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Half-Life Questions

   1. What is a becquerel?

 

   2. What is the half-life of a radioactive isotope?

 

   3. Another substance has a half-life of 3 hours. 
What fraction of the atoms will have decayed after 6 hours? 

 

   4. A radioactive substance activity falls from 8,000 counts per minute to 500 counts per minute in 20 hours. What is the half-life of the substance?

 

   5. After the 3rd half-life, how much of the sample is left?

 

   6. After the second half-life, how much of the sample is left?

 

   7.  What does the beta particle have a charge of?

 

   8.  If Carbon-14 has a half-life of 5,730 years, how old is a fossil if it has undergone 4 half-lives?.

 

   9.  If Carbon-12 has a half-life of 5,730 years, how old is a fossil if it has undergone 7half-lives?

 

   10. An isotope has a half-life of 6 hours, what percentage of the isotope will be left after 24 hours?