The total radiant energy emitted by a plane surface per unit area and unit time is called

Related MCQs

• The rate of radiant energy, which is emitted by a surface at any temperature and in small wavelengths is found from the known rate of energy, which under the same conditions would be emitted from a black surface, by multiplying with the absorptivity. Above enunciation is known as
• By doubling the temperature the radiant heat will increase
• In case the temperature of a hot body is increased by 50%, the amount of radiation emitted by it would increase by nearly
• A surface which diffusely reflects and emits tha same amount of energy which it receives by radiation, is known as
• If a surface is elastically hit by N balls each of mass M, moving with same velocity V, the force on the surface will be
• A Carnot refrigerator extracts 100 kcal of heat per minute from a cold room which is maintained at - 15?C and it is discharged to atmosphere at 30?C. The horse power required to run the unit would be
• The value of characteristic gas constant in kg metre per kg per deg C as
• When a fluid is passed in steady, flow through a porous plug in a duct under such conditions that heat transfer, kinetic energy change and potential change is negligible, the process is called
• If a system neither exchange mass nor energy with the surroundings, it is known as
• Internal energy of a perfect gas depends on