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clear
//
//
//
//Variable declaration
c=3*10**8 //velocity of light(m/sec)
e=1.6*10**-19 //charge of electron(coulomb)
Eg=1.44*e //band gap energy(J)
h=6.626*10**-34 //planck's constant(Jsec)
//Calculation
lamda=h*c/Eg //wavelength(m)
//Result
printf("\n wavelength is %0.0f angstrom",lamda*10**10)
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