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प्रश्न
Which of the following element transformations is NOT used as the basis of a radioactive rock-dating method?
विकल्प
Uranium changing into lead
Rubidium-87 changing into strontium
Rubidium-87 changing into lead
Potassium-40 changing into argon
MCQ
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उत्तर
The recognized transformations are uranium into lead, potassium-40 into argon, and rubidium-87 into strontium. Rubidium-87 changes into strontium, not lead, so the first option describes a transformation that is not used.
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