Mathematics, 09.12.2021 19:50 okaiikk

This exercise uses the radioactive decay model. Radium-221 has a half-life of 30 sec. How long will it take for 78% of a sample to decay? (Round your answer to the nearest whole number.)

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This exercise uses the radioactive decay model. Radium-221 has a half-life of 30 sec. How long wil...

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