An electron moves at $3.0\times 10^6\mathrm{m}{\mathrm{s}}^{-1}$. Use $h=6.626\times 10^{-34}\mathrm{J}\mathrm{s}$ and $m_e=9.1\times 10^{-31}\mathrm{kg}$. Its de Broglie wavelength is

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