A Certain Radioactive Substance Is Decaying at a Rate Proportional

question 35

Multiple Choice

A certain radioactive substance is decaying at a rate proportional to the amount present. If 100 grams decays to 13.5 grams in 4 years, how long will it take for 90 grams to decay to 30 grams?

• A) 2.405 yr
• B) 2.195 yr
• C) 0.501 yr
• D) Problem cannot be solved as stated.

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Definitions:

Probable Likelihood

The significant chance or high probability that an event will occur, often used in risk assessment.

Quick Ratio

A liquidity metric that indicates a company's capacity to pay off its short-term liabilities with quick assets (cash, marketable securities, and receivables).

Interest Calculations

The process of determining the cost of borrowing money or the gain on saved or invested money over a period, typically expressed as a percentage of the principal.

Journalize

The process of recording transactions in a journal or diary in accounting, which includes the date, accounts affected, and amounts, followed by a brief description of the transaction.