Respuesta :
The half-life = 10hrs.
Solution:
We know, activity after 'n' half-lives R=RO (1/2)n
125= 500 (1/2) n
= (1/2)n = (125/500) = 1/4 = (1/2)
n = 2
now,
nty2 = 20 hrs
2ty₂ = 20 hrs
ty₂ = 10 hrs
∴ half-life = 10 hrs
Half-life is the time it takes a given amount of a radioactive element to decay to half its original value. This also means that half-life is the time it takes for the activity of a source to decay to half its original value. Become. Isotope half-life is used to describe the rate at which the isotope decays and emits radiation. Half-life can be used to predict the amount of radioactive material remaining after a certain period of time.
Learn more about Half-life here:-https://brainly.com/question/1160651
#SPJ4
