If the half life of iridium-182 is 15 years, how much of a 3 gram sample is left after 2 half-lives? A) .57 grams
B) .70 grams
C) 2.25 grams
D) .75 grams

D. 0.75 grams

Explanation:

The data given on the iridium 182 are;

The half life of the iridium 182, = 15 years

The mass of the sample of iridium, N₀ = 3 grams

The amount left, N(t) after two half lives is given as follows;

For two half lives, t = 2 ×

∴ t = 2 × 15 = 30

∴ The amount left, N(t) = 0.75 grams

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