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In the Following Diagrams, a Represents a Radioactive Isotope That

Question 19

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In the following diagrams, A represents a radioactive isotope that decays into a new isotope, X. Each circle represents 1 mmol of atoms. t = 0: In the following diagrams, A represents a radioactive isotope that decays into a new isotope, X. Each circle represents 1 mmol of atoms. t = 0: t = 25.0 s: Over the first 25.0 s, what is the disintegration rate of A? A) 0.120 disintegrations per second B) 1.81 × 10<sup>21</sup> disintegrations per second C) 3.00 disintegrations per second D) 7.23 × 10<sup>19</sup> disintegrations per second E) 1.38 × 10<sup>-20</sup> disintegrations per second t = 25.0 s: In the following diagrams, A represents a radioactive isotope that decays into a new isotope, X. Each circle represents 1 mmol of atoms. t = 0: t = 25.0 s: Over the first 25.0 s, what is the disintegration rate of A? A) 0.120 disintegrations per second B) 1.81 × 10<sup>21</sup> disintegrations per second C) 3.00 disintegrations per second D) 7.23 × 10<sup>19</sup> disintegrations per second E) 1.38 × 10<sup>-20</sup> disintegrations per second Over the first 25.0 s, what is the disintegration rate of A?


A) 0.120 disintegrations per second
B) 1.81 × 1021 disintegrations per second
C) 3.00 disintegrations per second
D) 7.23 × 1019 disintegrations per second
E) 1.38 × 10-20 disintegrations per second

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