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clear
//Given
E=-13.6*1.9*10**-19 //J
m=9*10**9
e=1.6*10**-19
n=1
c=3*10**8
//Calculation
r=(-e**2*m)/(2.0*E)
v=c/(137*n)
//Result
printf("\n Orbital radius is %0.1f *10**-11 m",r*10**11)
printf("\n Velocity of the electron is %0.1f *10**6 m/s",v*10**-6)
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