A) \[3\times {{10}^{-3}}/day\]
B) \[9\times {{10}^{-3}}/day\]
C) \[1\times {{10}^{-3}}/day\]
D) \[6\times {{10}^{-3}}/day\]
Correct Answer: C
Solution :
Decay constant, \[\lambda =\frac{0.693}{{{T}_{1/2}}}=\frac{0.693}{77}\] \[=9\times {{10}^{-3}}/day\]
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