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Question

A radioactive sample has 5000 disintegration per minute initially and 1250 disintegration per minute after 5 seconds. Then the decay constant is
  1. 0.2ln2
  2. 0.8ln2
  3. 0.1ln2
  4. 0.4ln2

A
0.4ln2
B
0.8ln2
C
0.2ln2
D
0.1ln2
Solution
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Using formulae, N=Noeλt

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