Heat Transport in Carbon Nanotubes MCQ

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• Identify the expression that is in accordance with the Wiedemann Franz Law.
  ক

  Кel = (4π3kB4T)/h

  খ

  Кel = (4πkB3T)/2h

  গ

  Кel = 4πkBT

  ঘ

  Кel = (4π2kB2T)/3h
• Thermal conductivity of SWCNTs remains unaffected by the presence of single-atom vacancy defects.
  ক

  True

  খ

  False
• Which of the following theory is used to describe the ballistic phonon transport in SWCNTs?
  ক

  Kubo’s linear response theory

  খ

  Landauer theory

  গ

  Ainsworth attachment theory

  ঘ

  Max Planck’s Quantum theory
• Which expression indicates phonon transmission function ζph(w), in Landauer theory, in the quasiballistic region? b) ζph(w) = L0(w)/ c) ζph(w) = L0(w)/ d) ζph(w) = 1/
  ক

  ζph(w) = L02(w)/

  খ

  1+L0(w)

  গ

  1+L0(w)

  ঘ

  1+L0(w)
• What happens to the transmission function for phonons, at energy ħw, when SWCNTs contain defects?
  ক

  Deviates from stepwise structure

  খ

  Remains unchanged with temperature variation

  গ

  Phonon scattering is prevented

  ঘ

  A stepwise structure is exhibited
• Thermal conductance of CNTs are quantized at low temperature
  ক

  True

  খ

  False
• For T > θ(1/D), how does the thermal conductivity of MWCNTs vary?
  ক

  As T2.3

  খ

  As T-1

  গ

  As T2

  ঘ

  As T-5
• Which among the following factors causes a hindrance in heat transport of CNTs?
  ক

  Structure of CNTs

  খ

  Presence of extraneous contaminants

  গ

  Phonon conduction mechanism

  ঘ

  Crosslinking between individual CNTs
• Identify a method not used for calculating ζph(w) for nanoscale objects.
  ক

  Green’s function method

  খ

  Scattering boundary method

  গ

  Sword-in-sheath method

  ঘ

  Phonon wave packet scattering method