The Half-Life of a Particular Radioactive Isotope of Element X

question 102

Multiple Choice

The half-life of a particular radioactive isotope of element X is 100 years. If you know that 400 years ago a fossil contained 10 mg of this isotope, you would expect to find about _______ in that fossil today.

• A) 5 mg
• B) 2.5 mg
• C) 0.6 mg
• D) 0.3 mg
• E) 0.15 mg

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Definitions:

Diagnostic Services

Medical services involving the use of tests and procedures to determine the nature or cause of a health condition or disease.

Therapeutic Services

These are treatments and interventions designed to treat illness and improve health in individuals, ranging from medical and surgical treatments to counseling and physical therapies.

Entitativity

The property of a group that makes it seem like a coherent, distinct and unitary entity.

Social Facilitation

The tendency for individuals to perform differently when in the presence of others than when alone, typically enhancing performance on simple tasks and impairing it on complex tasks.