5. Define radio waves and microwaves.

Radio Waves are an electromagnetic wave of a frequency between about 104 and 1011 or 1012 Hz, as used for long-distance communication. A microwaves are a form of electromagnetic radiation with wavelengths ranging from about one meter to one millimeter; with frequencies between 300 MHz and 300 GHz. Different sources define different frequency ranges as microwaves; the above broad definition includes both UHF and EHF bands

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Explanation:

b.a device that inputs heat into a cool object