A body that is assumed to absorb all radiant energy and does not reflect any is called a (a)   .

The ratio of the emissive power of a surface to that of a black body is also called (a)  

(a)   absorbs all incident radiation of wavelength and direction

for a prescribed temperature and wavelength, no surface can emit more than a block body pertains to a (a)  

Although the radiation emitted by a black body is a function of wavelength and temperature, it is independent of direction. Thus, the black body is a (a)  

__NO___O__T_C _M__S_VE _O_E_ is defined as the energy emitted by a black body at a given wavelength in all directions per unit area per unit time.

(a)  

_______ _________is a form of electromagnetic radiation similar to X rays, light waves, gamma rays, and so on, differing only in wavelength. It obeys the same laws as light. It is an important mode of heat transfer and is especially important where large temperature differences occur.

(a)  

Thermal radiation is the energy emitted by matter as a result of its (a)   temperature.

Any matter with temperature above absolute zero (0 K) emits electromagnetic radiation. Electromagnetic radiation can be visualized as waves, traveling at the speed of light, thus, radiation is a _______ ________________.

(a)  

The type of radiation emitted by a body depends on its ______. The hotter the object is, the ______ the wavelength and the greater its amount.

(SEPARATE ANSWERS BY ",")

(a)  

Mechanism of Radiation

1. The thermal energy of the hot source at T1 is converted into energy in the form of ___________ _____.

(a)  

Mechanism of Radiation

2. These waves travel through intervening space in straight lines and strike a ___ object at T2.

3. The electromagnetic waves that strike the body are ________ by the body and converted back to thermal energy as heat.

(a)  

Mechanism of Radiation

The amount of radiation emitted by a body depends on its ______, and it’s proportional to T4. When this radiation strikes a surface, a portion of it is ______ and the rest enters the surface. On the portion that enters, some are absorbed by the material and the remaining radiation is _____ through.

(SEPARATE ANSWERS BY ",")

(a)  

monochromatic emissive power of a black body depends upon its __________ AND ___________ of emitted radiations.

(SEPARATE ANSWERS BY ",")

(a)  

Properties of shape factor are as:

1. The shape factor is purely a functional of (a)   parameters.

Properties of shape factor are as:

The shape factor of _____ surface or _____surface with the other surface enclosing the first is always unity. This is because all the radiation coming out from the convex surface is intercepted by the enclosing surface but not vice versa.

(a)  

Properties of shape factor are as:

A _____surface has a shape factor with itself because the radiation energy coming out from one part of the surface is intercepted by another part of the same surface. F1-1 is __.

(a)  

It is the transfer of heat by electromagnetic radiation, where the medium through which the heat is transferred usually is not heated.

(a)