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clear
//
//
//
//Variable declaration
c=3*10^8; //velocity of matter wave(m/s)
h=6.62*10^-34; //plank's constant(Js)
lamda=7000*10^-10; //wavelength(m)
n=2.8*10^19; //number of ions
//Calculation
E=n*h*c/lamda; //energy of laser pulse(joule)
//Result
printf("\n energy of laser pulse is %0.2f joule",E)
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