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3. Strontium 90 has a half-life of 25 years. If we start with a 4 mg mass of strontium: a. How much will be left

3. Strontium 90 has a half-life of 25 years. If we start with a 4 mg mass of strontium: a. How much will be left after 50 years? b. How long will it take the mass to decay to 0.25mg

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