What is the correct answer?


The rate of energy emission from unit surface area through unit solid angle, along a normal to the surface, is known as

A. Emissivity

B. Transmissivity

C. Reflectivity

D. Intensity of radiation

Correct Answer :

D. Intensity of radiation

Related Questions

Which of the following property of air does not increase with rise in… Which of the following is a case of steady state heat transfer? The concept of overall coefficient of heat transfer is used in heat transfer… The ratio of the emissive power and absorptive power of all bodies is… The heat transfer by conduction through a thick cylinder (Q) is given… Heat transfer takes place as per The radiation emitted by a black body is known as Heat conducted through per unit area and unit thick face per unit time… Metals are good conductors of heat because A cube at high temperature is immersed in a constant temperature bath.… In a shell and tube heat exchanger, baffles are provided on the shell… Unit of thermal diffusivity is Which of the following statement is wrong? Thermal conductivity of water at 20°C is of the order of A heat exchanger with heat transfer surface area A and overall heat transfer… LMTD in case of counter flow heat exchanger as compared to parallel flow… The ratio of the thickness of thermal boundary layer to the thickness… According to Wien's law, the wavelength corresponding to maximum energy… The amount of heat flow through a body by conduction is According to Stefan Boltzmann law, ideal radiators emit radiant energy… The concept of overall coefficient of heat transfer is used in case of… The ratio of the energy absorbed by the body to total energy falling on… A non-dimensional number generally associated with natural convection… According to Kirchoff's law, the ratio of emissive power to absorptivity… The product of Reynolds number and Prandtl number is known as The value of Prandtl number for air is about Pick up the wrong case. Heat flowing from one side to other depends directly… The emissivity for a black body is Thermal conductivity of a material may be defined as the In heat transfer, conductance equals conductivity (kcal/hr/sq.m/ °C/cm)…