The half-life of Sr-90 is 28 years.A sample of Sr-90 tested in 1960 emitted 400 counts per minute.
In what year will the sample emit 25 counts per minute?

Name: The half-life of Sr-90 is 28 years.A sample of Sr-90 tested in 1960 emitted 400 counts per minute. In what year will the sample emit 25 counts per minute?
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The Answer of The half-life of Sr-90 is 28 years.A sample of Sr-90 tested in 1960 emitted 400 counts per minute.
In what year will the sample emit 25 counts per minute?

The Half-Life of Sr-90 Is 28 Years