Question

the chart shows rate of decay.
half-lives elapsed\tfraction remaining\tpercentage remaining
0\t1/1\t100
1\t1/2\t50
2\t1/4\t25
3\t1/8\t12.5
4\t1/16\t6.25
5\t1/32\t3.125
which value is being measured in the columns labeled \fraction remaining\ and \percentage remaining\?
○ years of decay
○ quantity of energy
○ number of stable atoms
○ amount of material that has not decayed

Explanation:

• Analyze each option:
• "Years of decay" is related to the "Half - lives elapsed" column, not the "Fraction remaining" or "Percentage remaining" columns.
• The table is about decay of a material, not energy, so "quantity of energy" is incorrect.
• It's about the remaining material (could be atoms or mass), not specifically "number of stable atoms" as decay involves radioactive atoms turning into other forms, and the fraction/percentage is about the remaining undecayed material (regardless of atom type stability in a general decay context).
• "Amount of material that has not decayed" makes sense: the fraction and percentage show what portion of the original material is left undecayed after each half - life. For example, at 0 half - lives, 100% (or 1/1 fraction) of the material is undecayed. After 1 half - life, 50% (1/2 fraction) is undecayed, etc.

Answer:

D. amount of material that has not decayed