Relax

Respuesta :

superman1987
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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