The Half-Life of Cobalt-60 Is 5

question 47

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 unit time) 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.

Understand the concept of assimilation and accommodation as ways humans adapt cognitively according to Piaget.

Recognize the stages of cognitive development outlined by Piaget and the characteristics of each stage.

Identify the mechanisms of cognitive change (equilibration, disequilibrium) in Piaget's theory.

Describe the development and importance of schemes in cognitive development.

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