Physics, 05.05.2020 21:20 marie1211

PHYSICS PLEASE HELP!

If the half life of a given substance is 65 days, how long will it take for a 100-gram sample of the substance to decay until there is only 25 grams of the radioactive material remaining?

if a sample of radioactive isotopes takes 60 minutes to decay from 200 grams to 50 grams, what is the half life of the isotope?

If a 500.0 g sample of technetium-99 decays to 62.5 g of technetium-99 remaining in 639,000 years, what is the half life of technetium-99?

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