Photoelectric EffectHard
Question
A U238 sample of mass 1.0 g emits alpha particles at the rate 1.24 × 104 particles per second. (NA = 6.023 × 1023)
Options
A.The half life of this nuclide is 4.5 × 109 years
B.The half life of this nuclide is 9 × 109 years
C.The activity of the prepared sample is 2.48 × 104 particles/sec
D.The activity of the prepared sample is 1.24 × 104 particles/sec.
Solution
= λN = 
⇒
= 4.5 × 109 yrs.The activity = number of disintegration per second = 1.24 × 104 dps
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