# For 214Bi, the half-life period is 19.7 minutes. Calculate the radioactive decay constant. Also calculate how much of 1 gram sample of 214Bi will remain after 78.4 minutes.

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by acevivek

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by acevivek

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Half life = 19.7 minutes

**So decay constant is 0.0351 Bq.**

half life = 19.7 minutes

number of half lives in 78.4 minutes = 78.4/19.7 = 4

initial amount (N₀)= 1g

let after 4 half lives, remaining will be =

**So after 78.4 minutes, **** g 214Bi will be remaining.**

half life = 19.7 minutes

number of half lives in 78.4 minutes = 78.4/19.7 = 4

initial amount (N₀)= 1g

let after 4 half lives, remaining will be =