The water molecules gets trapped in the crystal structure to be analysed and will give a peak in the spectra at about 3500 /cm , and there by hindering with the IR spectra of the sample to be analysed .
The second problem with the contamination of the sample with water is , that water makes the potassium bromide disc opaque which will decrease the absorption of the IR by the sample .
I didn't know if you meant to the power of 14 but if you did here your answer: 3.64 x 10^-19 (you just multiply the frequency by Planck's constant= 6.63 × 10^–34)
