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The half life of a certain radioactive substance is 24 days. Given that the initial sample of the substance has a mass of 64 g, determine the mass which is left after 72 days.

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asked Jun 21, 2021 in Physics Form 4 by anonymous

The half life of a certain radioactive substance is 24 days. Given that the initial sample of the substance has a mass of 64 g, determine the mass which is left after 72 days.

radioactivity

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answered Jun 21, 2021 by anonymous

64 → 32 → 16 → 8
24 days 48days 72 days
3 half lives, 8g left
alternatively,
64 x (1/2)³

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