Work is the ability to cause life change??
Answer:
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Answer:
0.002
Explanation:
The half-life of the radioactive nucleus is related to its quantity, by the following equation:

<u>Where:</u>
<em>N(t): is the quantity of the radioactive nucleus at time t</em>
<em>N₀: is the initial quantity of the radioactive nucleus</em>
<em>t: is the time = 4.5x10⁹ years</em>
<em>t(1/2): is the half-life of the radioactive nucleus = 5x10⁸ years</em>

Therefore, the fraction of the radioactive element in the rock today is 0.002.
I hope it helps you!
When parking uphill on a two-way street with no curb, your front wheels should be: Turned to the right (toward the street). When you come to a corner where there are no traffic lights or stop signs, you should: Slow down, so you can stop, if necessary.