Final answer:
Certain materials absorb the energy of electromagnetic waves when they hit them, converting the energy into other forms.
Explanation:
When an electromagnetic wave hits a material, it can be transmitted, reflected, or absorbed. The material that absorbs the energy of a wave when it hits it is called an absorber. This interaction between the wave and the material leads to the conversion of wave energy into other forms, such as thermal energy in the case of microwaves heating food.
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