A radioactive isotope has a half-life of 10 days. Malik starts with 100 grams of this isotope. After 50 days, how many grams of the isotope will remain? Round your answer to the nearest gram.

Half-life (t½) is the amount of time required for a quantity to fall to half its value as measured at the beginning of the time period.

In this question (t½) of isotope is 100 years, which means that after 100 years half of the sample would have decayed and half would be left as it is.

After 100 years ( first half life) 40 /2 = 20 g decays and 20 g remains left.

After another 100 years ( two half lives or 200 years) 20 /2 = 10 g decays and 10 g remains left .

after two half lives or 200 years, 10 g of the isotope will be left.

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