A) \[0.8\,{{\log }_{e}}2\]
B) \[0.4\,{{\log }_{e}}2\]
C) \[0.2\,{{\log }_{e}}2\]
D) \[0.1\,{{\log }_{e}}2\]
E) \[0.6\,{{\log }_{e}}2\]
Correct Answer: B
Solution :
Given R = 1250,\[{{R}_{0}}=5000\]and t = 5 min Hence \[R={{R}_{0}}{{e}^{-\lambda t}}\] \[1250=5000{{e}^{-\lambda \times 5}}\] \[\lambda =0.4\,{{\log }_{e}}2\]
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