Digital ACT Science Practice Question #1536
Test your problem-solving accuracy on this official-caliber item. Select an answer choice to check your reasoning instantly.
Time to drop from 8,000 to 4,000 = 2.6 minutes.
Activity halves from 8,000 to 4,000 cpm in 2.6 minutes, and from 4,000 to 2,000 in another 2.6 minutes. Half-life is 2.6 minutes....
Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...
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