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Question

The fraction of a radioactive sample that will decay during half of its half life period is
  1. 212
  2. 12
  3. 121
  4. 12

A
12
B
121
C
212
D
12
Solution
Verified by Toppr

Let the half life be t12.

Then, λ=0.693t12=ln2t12

N=Noe⎜ ⎜ln2t12⎟ ⎟×t122
Ratio of decay =No1eln22No=1eln12=112=212

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