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//variable initialization
lembda1=4000 //wavelength of light (Å)
V1=2 //stopping potential (volt)
lembda2=6000 //wavelength of light (Å)
V2=1 //stopping potential (volt)
e=1.6*10^-19; //Charge of electron (coulombs)
c=3*10^8; //speed of light (meter/second)
ch=12400 //constant (eV Å)
//(i) Planck's constant
h=(e*(V1-V2)*lembda1*10^-10*lembda2*10^-10)/(c*((lembda2*10^-10)-(lembda1*10^-10))); //Planck's constant (joule-second)
//(ii) Work function
phi=(ch/lembda1)-V1; //work function of the material (eV)
printf("\n(i) Planck`s constant = h = %.1e joule-second\n(ii) Work function of the material = %.1f eV",h,phi);
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