The law of radioactive disintegration of a radioactive substance states that the rate of disintegration is proportional. at any instant, to the amount of the substance present. In 1962, an experiment on Strontium 90 (Sr90), a radioactive substance usually found in nuclear fallout was started. A certain amount (in grams) of Sr90 was initially placed in a sealed container. In 1987, it was found that Sr90 has reached its half-life. Further, it was observed that 7.5 grams remained in the container in 1970. How much Sr90 was initially stored for the experiment? How many years after half-life will it take to reduce the substance to just 12% of its initial value?
The law of radioactive disintegration of a radioactive substance states that the rate of disintegration is proportional. at any instant, to the amount of the substance present. In 1962, an experiment on Strontium 90 (Sr90), a radioactive substance usually found in nuclear fallout was started. A certain amount (in grams) of Sr90 was initially placed in a sealed container. In 1987, it was found that Sr90 has reached its half-life. Further, it was observed that 7.5 grams remained in the container in 1970. How much Sr90 was initially stored for the experiment? How many years after half-life will it take to reduce the substance to just 12% of its initial value?
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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The law of radioactive disintegration of a radioactive substance states that the rate of disintegration is proportional. at any instant, to the amount of the substance present. In 1962, an experiment on Strontium 90 (Sr90), a radioactive substance usually found in nuclear fallout was started. A certain amount (in grams) of Sr90 was initially placed in a sealed container. In 1987, it was found that Sr90 has reached its half-life. Further, it was observed that 7.5 grams remained in the container in 1970. How much Sr90 was initially stored for the experiment? How many years after half-life will it take to reduce the substance to just 12% of its initial value?
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