The half-life for a 100-gram sample of radioactive element X is 5 days. How much of element X remains after 10 days have passed? a 100 g b 50 g c 75 g d 25 g
The half-life of element X is 5 days, which means that after every 5 days, half of the sample will decay.
After 5 days pass, half of the 100-gram sample will remain, which is 100/2 = 50 grams.
After another 5 days pass, half of the remaining sample will decay. So, after 10 days, there will be 50/2 = 25 grams of element X remaining.
Therefore, the answer is d) 25 g.