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A $20 \mathrm{~g}$ object is moving with velocity $100 \mathrm{~ms}^{-1}$. The de Broglie wavelength (in $\mathrm{m}$ ) of the object is [Planck's constant $\left.\mathrm{h}=6.626 \times 10^{-34} \mathrm{~J} \mathrm{~s}\right]$
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The correct answer is:
$3.313 \times 10^{-34}$
$\lambda=\frac{h}{m v}=\frac{6.626 \times 10^{-31}}{20 \times 10^{-3} \times 100}=3.313 \times 10^{-34}$
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