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26 July, 01:43

A radioactive isotope of potassium has a half-life of 20 minutes if a 40 g sample of this isotope is allowed to decay for 80 minutes how many grams of the r

adioactive isotope will remain

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  1. 26 July, 03:19
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    There will be 2.5g left.

    Explanation:

    80/20 = 4 half lives

    40/2 = 20

    20/2 = 10

    10/2=5

    5/2 = 2.5
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