$\begin{array}{1 1}(a)\;1.72\times 10^{-7}m&(b)\;7.27\times 10^{-2}m\\(c)\;7.27\times 10^{-7}m&(d)\;1.32\times 10^{-6}m\end{array}$

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Kinetic energy =$\large\frac{1}{2}$$mu^2=4.55\times 10^{-25}J$

$u^2=\large\frac{4.55\times 10^{-25}\times 2}{9.108\times 10^{-31}}$

$u=10^3m/s$

$\therefore \lambda=\large\frac{h}{mu}$

$\Rightarrow \large\frac{6.625\times 10^{-34}}{9.108\times 10^{-31}}$

$\Rightarrow 7.27\times 10^{-7}m$

Hence (c) is the correct answer.

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