It is found that after 24!hours 1/8 of the mass of a sample of a radio-active isotope remains What is the half-life of this isotope?

7.72 years

Nuclear half-life expresses the time required for half of a sample to undergo radioactive decay.

Explanation:

0.01 = 67.0 × = 0.000149=

=log (0.000149)=12.7

=7.72 years

Hope this helps have a great day/afternoon :)

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