39. The concrete wall of a building is 0.10 m thick. The temperatureinside the building is 20.0 8C, while the temperature outside is 0.0 8C.Heat is conducted through the wall. When the building is unheated, theinside temperature falls to 0.0 8C, and heat conduction ceases. However,the wall does emit radiant energy when its temperature is 0.0 8C. Theradiant energy emitted per second per square meter at 0.0 8C is the sameas the heat lost per second per square meter due to conduction whenthe temperature inside the building is 20.0 8C. What is the emissivityof the wall?
Energy transfer
The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.
Molar Specific Heat
Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)
Thermal Properties of Matter
Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.
39. The concrete wall of a building is 0.10 m thick. The temperature
inside the building is 20.0 8C, while the temperature outside is 0.0 8C.
Heat is conducted through the wall. When the building is unheated, the
inside temperature falls to 0.0 8C, and heat
the wall does emit radiant energy when its temperature is 0.0 8C. The
radiant energy emitted per second per square meter at 0.0 8C is the same
as the heat lost per second per square meter due to conduction when
the temperature inside the building is 20.0 8C. What is the emissivity
of the wall?
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