4. If a radioactive substance has a half-life of 25 years, namely, every 25 years the...

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4. If a radioactive substance has a half-life of 25 years, namely, every 25 years the radiation decreases by 50%, answer the following. 4.1 4.2 4.3 Years required for the radiation to be reduced by 20% of its original amount Percentage of the original radiation left after the first 47 years Annual average percentage rate of decay in the first 47 years 4. If a radioactive substance has a half-life of 25 years, namely, every 25 years the radiation decreases by 50%, answer the following. 4.1 4.2 4.3 Years required for the radiation to be reduced by 20% of its original amount Percentage of the original radiation left after the first 47 years Annual average percentage rate of decay in the first 47 years