The Half-Life of Sr-90 Is 28 Years

question 72

Short Answer

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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Definitions:

Interval Variables

Variables measured along a scale in which each point is placed at an exact distance from each other, like temperature in Celsius.

Standard Deviation

A statistic that measures the dispersion of a dataset relative to its mean, indicating how spread out the data points are.

Coefficient of Correlation

A statistical measure that calculates the strength and direction of a linear relationship between two variables.

Slope

The rate of change in the variable on the y-axis per unit change in the variable on the x-axis in a coordinate system; it quantifies the steepness of a line.