Question

difference between radiation power density and radiation intensity

Answer 1

here is u r answer

Power density is a measure at the point of observation, often expressed by the instantaneous Poynting vector. Hence gives information at the observation point.

Radiation intensity on the other hand is a more normalized power density at the far field. Which thus gives information about the antenna source.

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Answer 2

Black-body radiation is the thermal electromagnetic radiation within or surrounding a body in thermodynamic equilibrium with its environment, emitted by a black body