A) half-life period
B) disintegration constant
C) number of atoms present at any time
D) number of neutrons
Correct Answer: B
Solution :
Reciprocal of disintegration constant (k) of a radioactive element is called its average period. It is represented by the letter \[\tau (tau)\]lambda \[(\lambda )\] \[\lambda =\frac{1}{k}\] \[\because \] \[k=\frac{0.693}{{{t}_{1/2}}}\] \[\lambda =\frac{1}{\frac{0.693}{{{t}_{1/2}}}}\] or \[\lambda =1.44\times {{t}_{1/2}}\]
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