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in a microwave emr oscillates causing water molecules to rotate and move in response. thus heating...

in a microwave emr oscillates causing water molecules to rotate and move in response. thus heating up food

?my question is what is the purpose of the cavity magnetron. why do we change the frequency to some given resonant frequency. why not just use the emr we create in the first place. is there some frequency that heats water best?

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The cavity magnetron is generally used to generate teh microwaves using the interaction of a steam of electrons with a magnetic field while moving past a series of open metal cavities.

so the question why can't we use emr (electromagnetic radiation) in the first place ?

since water is a molecule there is a certain frequency at which the molecule rotates which can be called as the resonant frequency so it is necessary to produce the frequency for the effective heating.

the cavity magnetron is a vaccum tube which generates the microwaves using the interaction of beam of electrons while moving past a series of open metal cavities. The frequency of the microwaves that are produced which also called as resonant ferquency is determined by the cavities physical dimension. So we need a magnetron to produce a certain frequency for the water molecule to rotate.

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