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The graph below shows the mass of a radioactive isotope plotted against time.

      

The graph below shows the mass of a radioactive isotope plotted against time.
chestry672017214.jpg
(a) Using the graph, determine the half-life of the isotope.
(b) Calculate the mass of the isotope present after 32 days.

  

Answers


John
(a) 8 days (from the graph it takes 8 days for mass to reduce by half i.e. from 10g to 5g).

(b) $\frac{N}{10}$ = $(1/2)^{\frac{32}{8}}$ = $\frac{N}{10} \; = \frac{1}{2}^4$

$\frac{N}{10} \; = \frac{1}{16}$ = 0.625g
johnmulu answered the question on June 7, 2017 at 11:26


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