• R Ghosh

      Articles written in Pramana – Journal of Physics

    • The radio frequency conductivity of some aliphatic alcohols at different temperatures

      R Ghosh I R A Chaudhury

      More Details Abstract Fulltext PDF

      Activation energies for viscous flow and conductivity are computed from experimental values of RF conductivity (frequency 400 kHz) at different temperatures for eight polar liquids. It is observed that for aliphatic alcohols the activation energy for conductivity is greater than that for viscous flow. However, their ratio is slightly greater than unity and is different for different alcohols whereas for nonassociating polar liquids the ratio is almost equal to unity. The dependence of conductivity on viscosity for the liquid alcohols does not follow the Walden’s law but can be well represented by Adamczewskis relation.

    • Optical mode-coupling in a ring due to a back-scatterer

      A Venugopalan Deepak Kumar R Ghosh

      More Details Abstract Fulltext PDF

      The coupling of light waves travelling clockwise and counterclockwise along an optical ring due to a back-scattering element is studied. An asymmetric mode splitting occurs as a consequence of the discontinuity suffered by the waves at the scattering point. The mode splitting shows up in an interference pattern and lends itself to an experimental verification.

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