A) \[{{10}^{-8}}s\]
B) \[{{10}^{-12}}s\]
C) \[{{10}^{-47}}s\]
D) \[{{10}^{-21}}s\]
Correct Answer: D
Solution :
Radius of the nucleus is\[1.6\times {{10}^{-14}}m\]. Time taken in crossing the nucleus \[=\frac{2R}{v}\] \[=\frac{2\times 1.6\times {{10}^{-14}}}{3\times {{10}^{7}}}\] \[={{10}^{-21}}s\]
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