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(a) A radioactive sample has 6.0 xx 10^(...

(a) A radioactive sample has `6.0 xx 10^(18)` active nuclei at a certain instant. How many of these nuclei will still be the same active state after two half-lives?
(b) Radioactive phosphours`-32` has a half-life of `14` days. A source containing this isotope has an initial activity of `10muCi`.
(i) What is the activity of the source after `42` days?
(ii) What time elapse before the activity of the source falls at `2.5muCi`?
(c) `1g` of a radioactive substance disintergrates at the rate of `3.7 xx 10^(10) dps`. The atomis mass of the substance is `226`. Calculate its mean life.

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