First, order the samples by decreasing initial radioactivity. Then calculate how long it will take for the amount of radionuclide in each sample to decrease to 1/8 of the initial amount. sample A B C D symbol 60 27 33 15 64 31 178 73 radionuclide 8 P Ga Ta half-life 5.0 years 25. days 3. minutes. 9.0 minutes initial radioactivity (choose one) ✓ (choose one) ✓ (choose one) ✓ (choose one) ✓ time for amount of radionuclide to decrease to 1/8 of initial amount years days minutes minutes

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Photochemistry

Photochemistry is the part of chemistry that studies the various mechanisms of reactions that are triggered by the presence of light energy. It also helps to study the changes involved in a molecule that can undergo the absorption of radiation.