The Model Describes the Amount of Cesium-137 Remaining After

question 64

Multiple Choice

The model describes the amount of Cesium-137 remaining after t years. Which one of the following written statements best describes the behavior of Cesium-137?

• A) The amount of radioactive substance decreases by half every years.
• B) The amount of radioactive substance increases by half every year.
• C) The amount of radioactive substance increases by half every years.
• D) The amount of radioactive substance decreases by half every 79 years.
• E) The amount of radioactive substance decreases by half every year.

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Definitions:

Semi-annually

Occurring twice a year, typically every six months.

Quarterly Payments

Payments made four times a year, typically used in the context of dividends or loan repayments.

Debt

An amount of money borrowed by one party from another, which needs to be repaid usually with interest.

Compounded Annually

Refers to the process where the interest on an investment or loan is calculated annually and added to the principal, so that the balance doesn't merely grow by the initial rate of interest but by the interest on the interest as well.