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7 April, 10:31

The isotope 208Tl undergoes β decay with a half-life of 3.1 min.

(a) What isotope is produced by the decay?

(b) How long will it take for 99.0% of a sample of pure 208Tl to decay?

(c) What percentage of a sample of pure 208Tl remains un-decayed after 1.0 h?

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  1. 7 April, 10:51
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    a. Pb 208

    b. About 21.7 minutes

    c. only a trace amount

    Explanation:

    It under goes beta decay.

    There should be virtually nothing after an hour
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