ऊष्मा चालकता की दृष्टि से सामान्यतः अधातु तत्व किस प्रकृति के होते हैं?

With reference to nano-scale thermal physics and thermal management technologies, consider the following statements: I. At nanoscale dimensions, heat transfer may become increasingly influenced by surface interactions and boundary scattering effects. II. Graphene and carbon nanotubes are being explored for thermal management applications because of their high thermal conductivity. III. Phase-change materials used in thermal energy storage systems absorb or release latent heat during change of phase. IV. Heat sinks used in electronic systems primarily function by eliminating thermal radiation from the device without involving conduction or convection. How many of the statements given above are correct?

It is more comfortable to wear white clothes during summer mainly because: