Answer:
What is the half-life of isotope X? 25 seconds
How many radioactive atoms of isotope X are left after 3 half-lives? 13
How many half-lives must have occurred if only 7 atoms of isotope X are left? 4
Explanation:
The half-life of isotope X is 25 seconds
The radioactive atoms of isotope X left after 3 half-lives are 13
Number of half-lives must have occurred if only 7 atoms of isotope X left are 4.
Half life is the time taken by a radioactive material for the radioactivity of to reduce by half its original value.
The half life equation is:
A = A₀ (½)^(t / T)
where A is the final amount, A₀ is the initial amount, t is the amount of time, and T is the half life.
The half-life of isotope X is 25 seconds
The radioactive atoms of isotope X left after 3 half-lives are 13
Number of half-lives must have occurred if only 7 atoms of isotope X left are 4.
Thus, the questions are answered.
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