Question

The half life of radon-223 is 3.8 days. How much of a 100 g sample is left after 15.2 days?

Answer 1

6.25 gram of sample

Explanation:

let us assume 15.2 days as 16 days, then splitting 16 days into 4 division as

$(1/2)\times (1/2)\times (1/2)\times(1/2) = (1/16)$

then original quantity will remain

Hence By the formula we have,

divide 100 gram by (1 / 16)

$100 gram\times (1/16) = 6.25$

6.25 gram sample is left after 15.2 days (approx-16 days).