freesyria1965
freesyria1965 freesyria1965
  • 15-05-2018
  • Chemistry
contestada

A radioactive sample is 555 years old. It’s half life is 111 years. How many half lives?

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superman1987
superman1987 superman1987
  • 24-05-2018
we are going to use the half-life formula:


the no. of half-lives =  the total time/time for one half-life

when the total time = 555 years

and the time for one half-life = 111 years

so by substitution:

∴ no. of half-lives = 555 / 111 

                              = 5 




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