How many parent isotopes based on half lives

Okay, so, after one half-life has passed, there will still be 50 units of the parent isotope, and 50 units of the daughter product will have been produced. And then after another half-life, 25 units of the parent isotope will still be there, and 75 units of the daughter product will have been produced.

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the sun's light combined with the visible wavelenghts form what is called ultraviolet radiation, which are the long waves at the end of a visible light sprectrum.

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