A Radioactive Substance Is Observed to Disintegrate at a Rate $\frac { 9 } { 10 }$

question 55

Multiple Choice

A radioactive substance is observed to disintegrate at a rate such that $\frac { 9 } { 10 }$ of the original amount remains after one year. What is the half-life of the substance?

• A) 0.301 yr
• B) 0.588 yr
• C) 0.556 yr
• D) 6.579 yr

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Definitions:

Asset Investment

The use of funds to purchase property, securities, or other assets to generate returns or achieve strategic goals.

Operating Assets

Assets used in the day-to-day operations of a business to generate revenue, excluding investment and idle assets.

Controllable Margin

A measure of profitability that represents the amount of income over which managers have control, usually after direct costs have been deducted from revenues.

ROI

Return on Investment, a measure used to evaluate the financial performance of an investment by dividing the benefit (or return) of the investment by its cost.