Physics · Nuclear Physics
A radioactive sample undergoes α decay. At time t1, its activity is A, and at another time t2, its activity becomes A/5. What is the average lifetime (τ) of the sample?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1(ln 5)/(t2 - t1)
- 2ln(t2 + t1)/2
- 3(t2 - t1)/ln 5✓
- 4(t1 - t2)/ln 5
Correct answer
(t2 - t1)/ln 5
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