Half-life is used to determine the age of the material
<h2>Explanation</h2>
The radioactive materials are always in the state of decay by losing their energy in the form of rays. The term half-life is used to measure their age after the specific time. Half-life is actually the time which is taken by the radioactive materials to reduce half its initial value and use to measure the age of elements. It is donated as t1/2.
For example, 10 g Barium-139 takes 86 mints to convert int 5g Barium-139 and 5g Lanthanum-139. This time of decay is different in the different element and tells their age after the specific time period. So, the right option is (1).
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People should learn about the currents, waves, and tides just in case of an emergency or the tides are too high. The people should know if their worried about their structure of their home, or worried about their safety.
1, I want to say in the mid atlantic. 2. you use the scale on the bottom left to answer so it 1cm=405km. 3. I think you pick a line on the picture and that's the age, but I'm not to sure because I don't see a key. I hope this helps.
