81. The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body
82. The thermal diffusivities for solids are generally
83. Heat transfer by radiation mainly depends upon
84. The transfer of heat by molecular collision is known as
85. According to Kirchoff's law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a
86. 40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is
87. The heat transfer takes place according to
88. In case of liquids and gases, the heat transfer takes place according to
89. Depending on the radiating properties, a body will be opaque when
90. Log mean temperature difference in case of counter flow compared to parallel flow will be
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