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Solution: How many mg of Radium will be left after 100 years?

How many mg of Radium  will be left after 100 years?

Problem Statement: EE Board April 1997

Radium decomposes at a rate proportional to the amount at any instant. In 100 years, 100 mg of radium decomposes to 96 mg. How many mg will be left after 100 years?

  • A. 88.60
  • B. 95.32
  • C. 92.16
  • D. 90.72

Problem Answer:

After 100 years, 92.16 mg of Radium will be left.

Solution:

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