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clear
//
//
//
//Variable declaration
h=6.63*10^-34; //planck's constant(J-sec)
e=1.6*10^-19; //charge of electron(c)
delta_t=2.5*10^-14*10^-6; //life time(s)
//Calculations
deltaE=h*10^-3/(4*%pi*delta_t*e); //minimum energy(keV)
//Result
printf("\n minimum energy is %0.5f keV",deltaE)
printf("\n answer in the book varies due to rounding off errors")
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