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need answer for both :) 3a) Rn-222 decays from 400 grams to 6.25 grams in 4 hours. How long is one half life? 3a) Rn-222

need answer for both :)

3a) Rn-222 decays from 400 grams to 6.25 grams in 4 hours. How long is one "half life"? 3a) Rn-222 decays from 400 grams to 6.25 grams in 4 hours. How long is one "half life"? [a]minutes

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