0 - 1.00 5 days - half decays - 0.50 remains 10 days - half of the .50 decays, 0.25 remains 15 days - half of the 0.25 decays - 0.125 remains At 15 days, 7/8 has decayed, 1/8 remains.
83) B210?has a half life of 5 days. The time taken for seven-eighth of a sample to decay is
Answer is:
15 days
Explanation:
Related Atoms and Nuclei MCQ with Answers
Answer is:
8 month
Explanation:
Alternatively, you could think about this intuitively. If 3/4 decayed, then that means that only one quarter is left. How many half lives does that take? Well, after one half life, you have 1/2 of the original. After another half life, you have 1/2 1/2=1/4 . S two half lives have passed
Answer is:
16.45 days
Explanation:
Use thre half life formula
Answer is:
0.03
Explanation:
The percentage of the original quantity of a radioactive material left after five half lives is approximately 3%
Answer is:
41290
Explanation:
After 1600yrs - 0.5 decayed, 0.5 left After 3200 yrs - there's 0.5 left, so you need to take half of that, i.e. a further 0.25 of the initial sample would have decayed. so total decayed = 0.75, total undecayed = 0.25 After 4800 - half of the 0.25 left will decayed, i.e. a further 0.125 of initial sample will decay. so total decayed = 0.75 + 0.125 = 0.875 of initial sample = 7/8 b) 6400 yrs is a further half life (from part a). After 4800 yrs, 1/8 is left, so after another half life, 1/16 will be left