A radioisotope of technetium is useful in medical imagingtechniques. A sample initially contains 80.0 mg of this isotope. After 24.0 h, only 5.0 mg of the technetium isotoperemains. What is the half-life of the isotope?(a) 3.0 h (b) 6.0 h (c) 12.0 h (d) 16.0 h (e) 24.0 h

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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.