A) \[{{10}^{-15}}s\]
B) \[\text{3}.0\times \text{1}{{0}^{\text{8}}}\text{ s}\]
C) \[3.33\times {{10}^{-24}}s\]
D) \[3.3\times {{10}^{-7}}s\]
Correct Answer: C
Solution :
One light fermi is time taken by light to travel a distance of 1 fermi ie, \[{{10}^{-15}}m\]. As \[t=\frac{l}{v}\] \[\therefore \] 1 light fermi \[=\frac{{{10}^{-15}}}{3\times {{10}^{8}}}\] \[=\frac{1\times {{10}^{-23}}}{3}\] \[=3.333\times {{10}^{-23}}\] \[=3.33\times {{10}^{-24}}s\]
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