$\begin{array}{1 1}(a)\;5.8\times 10^5m/s&(b)\;6.3\times 10^5m/s\\(c)\;5.8\times 10^2m/s&(d)\;5.8m/s\end{array}$

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According to Heisenberg's uncertainty principle

$\Delta u\Delta x\approx \large\frac{h}{4\pi m}$

$\Delta u \approx \large\frac{h}{4\pi m\Delta x}$

$\Rightarrow \large\frac{6.625\times 10^{\large-34}}{4\times (22/7)\times 9.108\times 10^{\large-31}\times 10^{-10}}$

$\Rightarrow 5.8\times 10^5m/s$

Hence (c) is the correct answer.

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