The rate of disintegration of a radioactive substance is proportional to the amount of the substance present at any instant. In 1962, an experiment on Strontium-90 (Sr90), a radioactive substance usually found in nuclear fall out, was started. A certain amount (in grams) of Sr90 was initially placed in a sealed container. In 1987, it was found that the Sr90 had 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 rate of disintegration of a radioactive substance is proportional to the amount of the substance present at any instant. In 1962, an experiment on Strontium-90 (Sr90), a radioactive substance usually found in nuclear fall out, was started. A certain amount (in grams) of Sr90 was initially placed in a sealed container. In 1987, it was found that the Sr90 had 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
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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The rate of disintegration of a radioactive substance is proportional to the amount of the substance
present at any instant. In 1962, an experiment on Strontium-90 (Sr90), a radioactive substance usually
found in nuclear fall out, was started. A certain amount (in grams) of Sr90 was initially placed in a
sealed container. In 1987, it was found that the Sr90 had 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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