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I hope chemistry was an okay topic, its from my earth sciences course, but didnt think that was best option. this is due tomorrow (allowed

I hope chemistry was an okay topic, its from my earth sciences course, but didnt think that was best option. this is due tomorrow (allowed help) and i really want to understand how to do this. please help, thank you so much! :) image text in transcribed
9. A certain radionuclide emits radiation at the rate of 15.0W at one instant of time and at 1.0W (microwatts) one hour latter. What is its half-life? (15 points)

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