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//variable initialization
mu=1.61*10^-27; //reduced mass of HCl molecule (kg)
c=3*10^8; //speed of light (m/s)
lembda=3.465*10^-6; //wavelength of infrared radiation (m)
//calculation of force constant
v=c/lembda; //frequency of radiation (s-1)
k=4*(%pi*v)^2*mu; //force constant of HCl molecule (N/m)
printf("\nforce constant = %.1f N/m",k);
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