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An unknown radioactive element decays

An unknown radioactive element decays into non-radioactive substances. In 420 days the radioactivity of a sample decreases by 39
1. 1 answer
2. asked by Kim
3. 6,194 views
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
3. 835 views
A radioactive element decays exponentially according to the function Q(t) = Q0ekt.If 100 mg of the element decays to 25 mg in 12
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2. asked by Rania
3. 1,224 views
A radioactive element decays exponentially according to the function Q(t) = Q0ekt.If 100 mg of the element decays to 25 mg in 12
1. 3 answers
2. asked by Rania
3. 3,663 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. 2,198 views
If 250 mg of a radioactive element decays to 200 mg in 48 hours, find the half-life of the element
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2. asked by Dom
3. 1,073 views
IF 80mg of a radioactive element decays to 10mg in 30 minutes, the half-life of this element isa.10 min b.20 min c.30 min d.40
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2. asked by Jazmin
3. 5,961 views
If 250mg of a radioactive element decays to 200mg in 48 hours, find the half-life of the element.ln(N<sub>o</sub>/N) = kt
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2. asked by Jen
3. 1,076 views
In 4 years, 30% of a radioactive element decays. Find its half-life. (Round your answer to one decimal place.)_____ yr
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2. asked by Dee
3. 1,696 views
Find the half-life of a radioactive element, which decays according to the function A(t)=A0e−0.0303t, where t is
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2. asked by Shelby
3. 149 views