Question

explain ferrys black body​

Answer 1

Absorptive power is defined as the ratio of radiations absorbed by a body to the radiations incident on it. ... Ferry designed an artificial black body using a hollow double walled sphere, wich is called Ferry's black body. In nature Black hole is a perfactly black body, it absorbs all radiations falling on it.

Answer 2

Answer:

a cavity with walls made of any material, with a small opening, is an excellent black body. This is Ferry's black body. It also absorbs all electromagnetic radiation incident on it irrespective of wavelength.