Question

explain radiations
......

Answer 1

$<b><I>$

RADIATIONS;

The process of radiation does not need any material for heat transfer energy is emitted by a body and this energy travels in space just like light (electromagnetic radiations)

1) ABSORPTIVE POWER: (a)
it is defined as the fraction of the incident radiation that is observed by the body it is denoted by" a "
it has no unit

2) EMISSIVE POWER:(E)
the radiant energy emitted per unit area per unit time is called as emissive power .
the unit of emissive power is
${wm}^{ - 2}$
3) BLACK BODY :
a body which absorbs all the radiation incident on it is called black body a perfect black body a= 1

4) EMISSIVITY (e) :
emissivity of surface can be defined as the ratio of inertial cover of the surface wave power of the perfect black body under identical conditions

# be brainly

Answer 2

In physics, radiation is the emission or transmission of energy in the form of waves or particles through space or through a material medium. This includes: electromagnetic radiation such as radio waves, visible light, and x-rays. particle radiation such as α, β, and neutron radiation.