Question

what is radiant energy ? write three uses of radiant energy​

Answer 1

In physics, and in particular as measured by radiometry, radiant energy is the energy of electromagnetic and gravitational radiation. As energy, its SI unit is the joule. The quantity of radiant energy may be calculated by integrating radiant flux with respect to time. 

The term "radiant energy" is most commonly used in the fields of radiometry, solar energy, heating and lighting, but is also sometimes used in other fields (such as telecommunications).

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Answer 2

Radiant energy

The term radiant energy refers to

energy that travels by waves or particles, particularly electromagnetic radiation such as heat or x-rays. Radiant energy is created through electromagnetic waves and was discovered in 1885 by Sir William Crookes.

Three use of Radiant energy

The heat emitted from a campfire.

Emission of heat from a hot sidewalk.

X-rays give off radiant energy.