How much cesium (half-life = 2 years) would remain from a 10 g sample after 4 years?A.0 gB.8 gC.21221 gD.5 gSUBMITarrow_backPREVIOUS
Question
How much cesium (half-life = 2 years) would remain from a 10 g sample after 4 years?
A. 0 g
B. 8 g
C. 21221 g
D. 5 g
SUBMIT
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Solution
The half-life of a substance is the time it takes for half of it to decay. In this case, cesium has a half-life of 2 years.
Step 1: After 2 years (one half-life), half of the 10g sample would remain. So, 10g / 2 = 5g.
Step 2: After another 2 years (another half-life), half of the remaining 5g would decay. So, 5g / 2 = 2.5g.
So, after 4 years, 2.5g of the original 10g sample of cesium would remain. The answer is not listed in the options you provided.
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