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//To calculate the velocity and kinetic energy of electron
h = 6.626*10^-34; //planck's constant, J sec
m = 9.1*10^-31; //mass of electron, kg
e = 1.6*10^-19;
lamda = 1.66*10^-10; //wavelength, m
v = h/(m*lamda); //velocity of electron, m/sec
v_km = v*10^-3; //velocity of electron, km/sec
printf("velocity of electron is %d km/sec",v_km);
KE = (1/2)*m*v^2; //kinetic energy, J
KE_eV = KE/e; //kinetic energy, eV
printf("kinetic energy of electron is %5.2f eV",KE_eV);
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