Question

what is ferry black body​

Answer 1

Answer:

Ferry's black body consists of a hollow double-walled sphere which is blackened inside. The sphere has a small hole on its surface. Directly opposite to hole, there is a wedge shaped structure inside the sphere.

Answer 2

Answer:

Blackbody, in physics, a surface that absorbs all radiant energy falling on it. The term arises because incident visible light will be absorbed rather than reflected, and therefore the surface will appear black. The concept of such a perfect absorber of energy is extremely useful in the study of radiation phenomena.