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////Given
E=-3.4 //total energy in ev
h=6.63*10**-34 //Js
m=9.1*10**-31
e=1.6*10**-19
//Calculation
//
K=-E
v=h/(sqrt(2*m*K*e))
//Result
printf("\n (a) Kinetic energy %0.3f ev",K)
printf("\n (b) de broglie wavelength of the electron is %0.3f A",v*10**10)
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