A potential barrier of \[0.3\] Volt exists across a p-n junction. The depletion region is 1 pm wide. The intensity of electric field in this region is E. If electron with speed \[5\times {{10}^{5}}m/s\] approaches this p-n junction from n-side, what will be its speed V on entering the p-side?

• A. \[V=12\times {{10}^{5}}m/s\]
• B. \[V=1\times {{10}^{4}}m/s\]
• C. \[V=3.8\times {{10}^{5}}m/s\]
• D. \[V=1.6\times {{10}^{4}}m/s\]