Thermal Propert...

There is a rough black spot on a polished metallic plate. It is heated upto 1400 K approximately and then at once taken in a dark room. Which of the following statements is true?

At a certain temperature for given wavelength, the ratio of emissive power of a body to emissive power of black body in same circumstances is known as

Two thermometer A and B are exposed in sun light. The valve of A is painted black, but that of B is not painted. The correct statement regarding this case is

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

A hot body will radiate heat most rapidly if its surface is

An ideal black body at room temperature is thrown into a furnace. It s observed that

Absorption coefficient of an open window is

According to Wien\'s alw

On investigation of light fro three different stars A, B and C. It was found that in the spectrum of A the intensity of red colour is maximum, in B the intensity of blue colour is maximum and in C the intensity of yellow colour is maximum. From these observation it can be concluded that

If wavelength of maximum intensity of radiations emitted by the sun and the moon are 0.5 × 10^–1 m and 10^–4m respectively, the ratio of their temperature is