A) 6.93 h
B) 20 h
C) 7.2 h
D) 14.4 h
Correct Answer: D
Solution :
Half life period \[{{t}_{1/2}}=\frac{0.693}{\lambda }\] or mean life \[=\frac{Half\,life\,period\,({{t}_{1/2}})}{0.693}\] Given, \[{{t}_{1/2}}=10hr\] So, mean life \[=\frac{10}{0.639}=14.4hr\]
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