Solution:
1.Find the mass of the sodium atom:
m= M/Na = 22.99/6.02*1023 = 3.819*10-23g = 3.819*10-26kg
2.By the ratio of De Broglie:
α = h/mu; u = h/mα = 6.626*10-34/3.819*10-26*1.02*10-12 = 17010 m/s = 1.70*104m/s
Answer: 1.70*104 m/s
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