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clear
clc
disp('Exa-3.2');
I=120;r=0.1*10^-9;Eev=2.3 //I-intensity in W/m^2 r in m & E in electron volt
A=%pi*r^2;K=1.6*10^-19; // A=area and K is conversion factor from ev to joules
t= Eev*K/(I*A); //time interval
printf('The value of time interval was found out to be %.1f sec',t);
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