The Half-Life of Cobalt-60 Is 5

question 54

Multiple Choice

The half-life of cobalt-60 is 5.3 years,while that of strontium-90 is 28 years.Suppose you have a sample of each,such that they initially contain equal numbers of atoms of these nuclides.How will the activities (number of decays per second) of the samples compare?

• A) The activity of the cobalt-60 sample will be greater.
• B) The activities cannot be compared without more information.
• C) The activities will be equal.
• D) The activity of the strontium-90 sample will be greater.

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Definitions:

Attitude-Behavior Consistency

The degree to which a person's convictions are faithfully reflected in the way they act across different scenarios and over time.

Initiators of Sexual Activity

Individuals who take the lead role in starting or suggesting sexual activity within a relationship or encounter.

Context-Dependent

The principle that information is easier to retrieve in the same environment where it was encoded, highlighting the relationship between contextual cues and memory.

Conscious System

A cognitive system in humans that encompasses awareness of oneself and one's environment, enabling thought, memory, and perception.