gymzach35481 gymzach35481
  • 12-01-2024
  • Physics
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A 120 mg sample of a radioactive substance has a half-life of 4.5 hours. What mass of the sample will remain after 18 hours?
a. 1.5 mg
b. 6.7 mg
c. 7.5 mg
d. 15 mg

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