Photoelectric EffectHard
Question
Two identical samples (same material and same amount initially) P and Q of a radioactive substance having mean life T are observed to have activities AP & AQ respectively at the time of observation. If P is older than Q, then the difference in their ages is:
Options
A.T ln 
B.T ln 
C.
ln
ln D.T
Solution
AP = AQ e−λt = AQ e-1/Tt ∴ t = T ln 
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