A. Directly proportional to thermal con¬ductivity B. Inversely proportional to density of substance C. Inversely proportional to specific heat D. All of the above
A. Varies with temperature B. Varies with the wave length of incident ray C. Varies with both D. Does not vary with temperature and wave length of the incident ray
A. Direct mixing of hot and cold fluids B. A complete separation between hot and cold fluids C. Flow of hot and cold fluids alternately over a surface D. Generation of heat again and again
