= 20.8A0
= 20.8*10^-10m [ 1A0 = 10^-10 m]
m = 9*10^-31Kg
h = 6.626*10^-34 j-sec
= h/mv
V = h/m
= 6.626*10^-34 /9*10^-31*20.8*10^-10 =3.6*10^5 m/sec >>>>answer
c. 3.6*10^5 m/sce>>>answer
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