Why Is the Decay of Potassium to Argon Used Instead

question 39

Multiple Choice

Why is the decay of potassium to argon used instead of the decay of potassium to calcium?

• A) Calcium is prevalent in too many rocks.
• B) Argon stays in the rock for a longer period of time so it is a more reliable measurement.
• C) Calcium dissolves in water so cannot be measured accurately.
• D) Argon is a reactive element and will only be present due to the decay of the potassium isotope.

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