Element a Decays into Element B with a Half-Life of 700

question 1

Multiple Choice

Element A decays into element B with a half-life of 700 million years. An astronomer finds a rock that she knows was formed originally without any B present. But the rock now contains both A and B, with the A+B portion of the rock being 1/8 A and 7/8 B. How old is the rock?

• A) 350 million years
• B) 700 million years
• C) 1.4 billion years
• D) 2.1 billion years

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