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When a radioactive sample decays,

The mass of a radioactive sample is represented in the graph below. The initial mass of 32 mg decays to 8 mg after 21 hours.1)Wh
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2. asked by alejandro
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An unknown radioactive element decays into non-radioactive substances. In 420 days the radioactivity of a sample decreases by 39
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2. asked by Kim
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An unknown radioactive element decays into non-radioactive substances. In 120 days the radioactivity of a sample decreases by 59
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2. asked by Erica
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The rate at which an amount of a radioactive substance decays is modeled by the differential equation dA/dt = kA, where A is the
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2. asked by ronnieday
3. 2,676 views
If a 25 mg sample of radioactive material decays to 18.4 mg in 5 years, how long will it take the sample to decay to 20.5 mg?
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2. asked by Brianna
3. 549 views
An unknown radioactive element decays into non-radioactive substances. In 100 days the radioactivity of a sample decreases by 64
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2. asked by Rachel
3. 2,184 views
Suppose 32000 radioactive nuclei are in a sample. About how many remain after two days if the half-life is 22 hrs? What is the
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2. asked by Anonymous
3. 572 views
As a sample of the radioactive isotope 131 I decays, its half-lifea)decreases b)increases c)remains the same
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2. asked by Danny
3. 4,354 views
A sample of a radioactive isotope had an initial mass of 800 mg in the year 2000 and decays exponentially over time. A
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2. 72 views
A sample of a radioactive isotope had an initial mass of 370 mg in the year 2000 and decays exponentially over time. A
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2. 73 views