Earn $100 Online Daily. Work From Home. Click Here

What is the correct answer?


If the temperature of a solid surface changes from 27°C to 627°C, then its emissive power changes in the ratio of

A. 6

B. 9

C. 27

D. 81

Related Questions

According to Kirchoff's law, the ratio of emissive power to absorptivity… A heat exchanger with heat transfer surface area A and overall heat transfer… Thermal diffusivity of a substance is given by (where h = Thermal diffusivity,… The ratio of the emissive power and absorptive power of all bodies is… The total emissivity power is .defined as the total amount of radiation… Which of the following would lead to a reduction in thermal resistance? Two balls of same material and finish have their diameters in the ratio… Joule sec is the unit of Temperature of steam at around 540°C can be measured by In counter current flow heat exchanger, the logarithmic temperature difference… A non-dimensional number generally associated with natural convection… The concept of overall coefficient of heat transfer is used in case of… In a heat exchanger with one fluid evaporating or condensing, the surface… The process of heat transfer from one particle of the fluid to another… Thermal diffusivity of a substance is The heat transfer takes place according to In heat transfer, conductance equals conductivity (kcal/hr/sq.m/ °C/cm)… Heat is closely related with A steam pipe is to be insulated by two insulating materials put over each… The thermal diffusivities for gases are generally The ratio of surface convection resistance to the internal conduction… Kirchhoff's law states that The emissive power of a body depends upon its Log mean temperature difference in case of counter flow compared to parallel… Thermal conductivity of water ________ with rise in temperature. Moisture would find its way into insulation by vapour pressure unless… Wiens law states that the wave length corresponding to ________ is proportional… Upto the critical radius of insulation, According to Stefan's law, the total radiation from a black body per second… Heat transfer takes place as per