A Rock Sample Containing an Isotope with a Half-Life of 28

question 60

Multiple Choice

A rock sample containing an isotope with a half-life of 28 million years has an initial mass of 184 grams. How much time has elapsed after three half-lives?

• A) 6.5 million years
• B) 9.3 million years
• C) 32 million years
• D) 56 million years
• E) 84 million years

Identify and understand the functions of various glands in the endocrine system.

Recognize how the brain responds to stimuli, including music and physical activity.

Distinguish between the subdivisions of the nervous system.

Understand the concept and physiological basis of the runner's high.

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