Matter Waves: What is the de Broglie wavelength of a ball of mass 200 g moving at 30 m/s? (h = 6.626 × 10-34 J ? s)
A. 1.1 × 10-34 m
B. 2.2 × 10-34 m
C. 4.5 × 10-28 m
D. 6.7 × 10-27 m
Answer: A
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