'A certain radioactive material loses 25% of its mass in 10 minutes_ What is its half life_ (a) 19.12 minutes 28.34 minutes 31.02 minutes 24.09 minutes None of the above:'
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25A_{0} = 0.75A_{0}\) Show more…
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The half-life of a radioactive substance is $20 \mathrm{~min}$. The approximate time interval $\left(t_{2}-t_{1}\right)$ between the time $t_{2}$ when $\frac{2}{3}$ of it has decayed and time $t_{1}$ when $\frac{1}{3}$ of it had decayed is (a) $14 \mathrm{~min}$ (b) $20 \mathrm{~min}$ (c) $28 \mathrm{~min}$ (d) $7 \mathrm{~min}$
Atoms, Molecules and Nuclei
Round 2
(I) A radioactive material produces 1280 decays per minute at one time, and 4.6 $\mathrm{h}$ later produces 320 decays per minute. What is its half-life?
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