What happens to the transmission function for phonons, at energy ħw, when SWCNTs contain defects?

What happens to the transmission function for phonons, at energy ħw, when SWCNTs contain defects? Correct Answer Deviates from stepwise structure

The structure of SWCNTs often contains defects, for example: single-atom vacancies, isotope impurities etc. These deviate the ζph(w) from stepwise structure due to the phonon scattering with defects. This mainly occurs at higher energies while it remains unchanged in the lower – energy regions.
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Thermal conductivity of SWCNTs remains unaffected by the presence of single-atom vacancy defects.
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Read the passage carefully and choose the best answer to each question out of the four alternatives and click the button corresponding to it.
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