Why is the frequency of microwaves used for cooking, and why do these ovens make use of reflection?

Question

Why is the frequency of microwaves used for cooking, and why do these ovens make use of reflection?

Answer 1

Continuing the previous answers.

The oven is a Faraday Cage, so, waves cannot leave the inside of the oven, and since the oven is a 'confined cage', waves will reflect inside so many times, until they lose energy. So, reflections is part of the propagation modes that could exist inside the Faraday cage

Answer 2

Yup.

The previous answer is correct.  However fat does too and warms quicker than water alone.

Answer 3

Microwave ovens generate energy at approximately 2.45GHz, that's the resonant frequency of the water molecule.

The reflector(s) scatter the RF energy so that things are cooked evenly.