Jiminsshi asked in Physics

How To do

Thank You

Bakul Biswas answered this

Dear student,
look here the heating elements are there in the top as well as in the bottom and again you can see that the walls are also metallic thus the thermal energy gets transferred from top to bottom to the food.
The whole process is described below:
  1. Inside the strong metal box, there is a microwave generator called a magnetron. When you start cooking, this takes electricity from the power outlet and converts it into high-powered, 12 cm (4.7 inch) radio waves.
  2. The magnetron blasts these waves into the food compartment through a channel called a wave guide.
  3. The food sits on a turntable, spinning slowly round so the microwaves cook your food evenly.
  4. The microwaves bounce back and forth off the reflective metal walls fixed inside the food compartment, just like light bounces off a mirror. When the microwaves reach the food itself, they don't simply bounce off. Just as radio waves can pass straight through the walls of your house, so microwaves penetrate inside the food. As they travel through it, they make the molecules inside it vibrate more quickly.
  5. Vibrating molecules have heat so, the faster the molecules vibrate, eventually the food becomes hotter. Thus the microwaves pass their energy onto the molecules in the food, rapidly heating it up.