A) \[\frac{1}{9\lambda }\]
B) \[\frac{1}{\lambda }\]
C) \[\frac{1}{7\lambda }\]
D) \[\frac{1}{8\lambda }\]
Correct Answer: C
Solution :
[c] No option is correct |
If we take \[\frac{{{N}_{A}}}{{{N}_{B}}}=\frac{1}{e}\] |
Then \[\frac{{{N}_{A}}}{{{N}_{B}}}=\frac{{{e}^{-8\lambda t}}}{{{e}^{-\lambda t}}}\] |
\[\frac{1}{e}={{e}^{-7\lambda t}}\] |
\[-1=-7\lambda t\] |
\[t=\frac{1}{7\lambda }\] |
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