Atomic StructureHard
Question
The half life of a radioactive substance against α - decay is 1.2 × 107 s. What is the decay rate for 4.0 × 1015 atoms of the substance
Options
A.4.6 × 1012 atoms/s
B.2.3 × 1011 atoms/s
C.4.6 × 1010 atoms/s
D.2.3 × 108 atoms/s
Solution
We have 
= λN
λ =
× 4 × 1015
= 2.3 × 108 atom/s
= λNλ =
× 4 × 1015 = 2.3 × 108 atom/s
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