$A$ ball of mass $0.12 \ kg$ is moving with a speed $20 \ m \ s^{-1}$. Then its de Broglie wavelength is . . . . . . . ( $h = 6.63 \times 10^{-34} \ J \ s$ )
- A$2.76 \times 10^{-34} \ m$
- B$1.76 \times 10^{-34} \ m$
- C$3.76 \times 10^{-34} \ m$
- D$4.76 \times 10^{-34} \ m$
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