Which THREE of the following are evidence that radioactive decay rates are constant?Group of answer choicesanalyses using two radioactive isotopes yield the same agecomparing isotopic ages with relative age relationshipsmeasurable amounts of parent and daughter atoms are present in rocksmeasurements of decay have been found not to varymost rocks behave as closed systemsthe laws of physics predict that decay rates should be constant
Question
Which THREE of the following are evidence that radioactive decay rates are constant?Group of answer choicesanalyses using two radioactive isotopes yield the same agecomparing isotopic ages with relative age relationshipsmeasurable amounts of parent and daughter atoms are present in rocksmeasurements of decay have been found not to varymost rocks behave as closed systemsthe laws of physics predict that decay rates should be constant
Solution
The three pieces of evidence that radioactive decay rates are constant are:
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Analyses using two radioactive isotopes yield the same age: This shows that regardless of the type of isotope used, the rate of decay remains constant, thus providing evidence of a constant decay rate.
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Measurements of decay have been found not to vary: This is direct evidence that decay rates are constant. If decay rates varied, then measurements would show this variation.
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The laws of physics predict that decay rates should be constant: Theoretical predictions based on the laws of physics support the idea that decay rates are constant. This is a strong piece of evidence because the laws of physics are well-established and widely accepted.
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