If the de Broglie wavelength of a dust particle of mass $1.0 \times 10^{-9} \,kg$ is $3 \times 10^{-25} \,m$, then the speed of the particle is . . . . . . . $\left(h=6.625 \times 10^{-34} \,J \,s\right)$
- A$1.1 \,m \,s^{-1}$
- B$1.2 \,km \,s^{-1}$
- C$1.0 \,km \,s^{-1}$
- D$2.2 \,m \,s^{-1}$
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