The half-life of radium-226 is 1620 years. How much of one gram of radium-226 will remain unchanged after four half-lives?
2 answers:
The correct answer is option C : 0.0625g <span>of one gram of radium-226 will remain unchanged after four half-lives. </span>
Answer:
0.0625 g
Step-by-step explanation:
Given : The half-life of radium-226 is 1620 years.
Formula of half life:

So.
= initial amount
P(t)= mass of radioactive material at time interval (t)
1 half life = 1620 years
4 half lives = 4 * 1620
So, t = 4 * 1620
Substituting the values :




Hence 0.0625 g of one gram of radium-226 will remain unchanged after four half-lives
Option C is correct.
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