The wavelength of a de-Broglie wave is $2 \mu m$. Calculate its momentum. (Given: $h = 6.63 \times 10^{-34} \ J \cdot s$)
- A$3.315 \times 10^{-28} \ kg \cdot m/s$
- B$1.16 \times 10^{-28} \ kg \cdot m/s$
- C$4.95 \times 10^{-28} \ kg \cdot m/s$
- D$9.9 \times 10^{-28} \ kg \cdot m/s$
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