The Graph Shows the Decay Rate R as a Function

question 68

Multiple Choice

The graph shows the decay rate R as a function of the time t for three radioactive samples. Rank the samples according to their half-lives, shortest to longest.

• A) 1, 2 ,3
• B) 1, 3, 2
• C) 2, 1, 3
• D) 2, 3, 1
• E) 3, 1, 2

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Definitions:

Protocell

Membranous sac that contains interacting organic molecules; hypothesized to have formed prior to the first life forms.

Precambrian

Period of Earth’s history from 4.6 billion to 541 million years ago: the Hadean, Archean, and Proterozoic eons.

Archaean

Relating to the Archaea domain, consisting of single-celled organisms distinct from bacteria and eukaryotes, often found in extreme environments.