D. Radiation
What is Radiation?
- Radiation is the transfer of heat energy through space by electromagnetic radiation.
- Most of the electromagnetic radiation that comes to the earth from the sun is invisible.
- Only a small portion comes as visible light. Light is made of waves of different frequencies.
There are four major types of radiation:
- alpha,
- beta,
- neutrons,
- and electromagnetic waves such as gamma rays.
They differ in mass, energy, and how deeply they penetrate people and objects.
Learn more about Radiation here
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