Use the following to answer questions:
Refer to the diagram below, showing the decay of a radioactive substance.
-Assuming this substance started decaying 280,000 years ago, and 4 mg of it remains, there was roughly how much of the original substance?

Question

Use the following to answer questions:
Refer to the diagram below, showing the decay of a radioactive substance. 
-Assuming this substance started decaying 280,000 years ago, and 4 mg of it remains, there was roughly how much of the original substance?

Quizplus · Accepted Answer

Based on the graph, we can see that after 280,000 years, the substance has decayed to approximately 1/16th of its original amount. Therefore, if 4 mg remains, then the original substance was approximately 16 times greater, or 64 mg. Therefore, the answer is D) 16 mg.

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