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//Variable declaration
h=6.63*10**-34; //planck's constant
c=3*10**8; //velocity of light(m/s)
Eg=1.44; //energy gap(eV)
e=1.6*10**-19;
//Calculation
lamda=h*c/(Eg*e); //wavelength(m)
//Result
printf('wavelength is %0.3f angstrom \n',(lamda*10**10))
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