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Question

Based on the graph, 2 half-lives equals
Responses

A 4.5 billion years.4.5 billion years.

B 9 billion years.9 billion years.

C 12.5 billion years.12.5 billion years.

D 18 billion years.

Answer 1

To determine how many years correspond to 2 half-lives, we need to know the duration of a single half-life. In the absence of specific context from the graph mentioned, let's assume that the half-life indicated is 2.25 billion years (a common half-life for certain isotopes).

Using this assumption:

• 1 half-life = 2.25 billion years
• 2 half-lives = 2.25 billion years × 2 = 4.5 billion years

Thus, based on this reasoning, the correct response would be:

A 4.5 billion years.

If the half-life mentioned in the graph is different, please provide that specific duration for a more accurate calculation.