$A$ body,which emits radiations of all possible wavelengths,is known as ...........

Good absorbers of heat are

$A$ certain substance emits only the wavelengths ${\lambda _1}, {\lambda _2}, {\lambda _3}$ and ${\lambda _4}$ when it is at a high temperature. When this substance is at a colder temperature,it will absorb only the following wavelengths:

In the rainy season,on a clear night,the black seat of a bicycle becomes wet because:

There is a black spot on a body. If the body is heated and carried into a dark room,then it glows more than the rest of the body. This can be explained on the basis of:

$A$ perfectly black body is placed in an enclosure (furnace) at room temperature. Then: