A) \[1.5\times {{10}^{9}}\]
B) \[4.62\times {{10}^{8}}\]
C) \[6.67\times {{10}^{8}}\]
D) \[10.35\times {{10}^{8}}\]
Correct Answer: C
Solution :
Mean life \[=\frac{1}{\lambda }\]\[=6.67\times {{10}^{8}}\sec .\]
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