The total emissivity power is .defined as the total amount of radiation emitted by a black body per unit_______________?

Related Mcqs:

When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by ___________________?

A. conduction B. convection C. radiation D. conduction and convection E. convection and radiation...

Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of__________________?

A. 0.002 B. 0.02 C. 0.01 D. 0.1 E. 0.5...

Thermal conductivity of wood depends on_______________?

A. moisture B. density C. temperature D. all of the above E. none of the above...

According of Kirchhoff’s law______________________?

A. radiant heat is proportional to fourth power of absolute temperature B. emissive power depends on temperature C. emissive power and absorptivity are constant for all bodies D. ratio of emissive power to absorptive power is maximum for perfectly black body E. ratio of emissive power to absorptive power for all bodies is same and … According of Kirchhoff’s law______________________?Read More...

A grey body is one whose absorptivity _________________?

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 E. there is no such criterion...