A) \[150\text{ }km\,\,{{s}^{-1}}\]
B) \[200\text{ }km\,\,{{s}^{-1}}\]
C) \[500\text{ }km\,\,{{s}^{-1}}\]
D) \[250\text{ }km\,\,{{s}^{-1}}\]
E) \[100\text{ }km\,\,{{s}^{-1}}\]
Correct Answer: C
Solution :
From condition of stopping potential \[\frac{1}{2}m{{v}^{2}}=eV\] \[v=\sqrt{\frac{2eV}{m}}=\sqrt{2\times 1.76\times {{10}^{11}}\times 0.71}\] \[=5\times {{10}^{5}}m{{s}^{-1}}=500\text{ }km{{s}^{-1}}\]
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