microwaves are metal because metal reflects microwave energy so you get the waves bouncing around the box. The bouncing waves make the food inside the microwaves warm.
No there is no microwaves that you can put metal in without it catching on fire.
No, the metal will reflect the microwaves and damage the magnatron (the part that produces the microwaves).
metal and glass
Microwaves are made of metal because metal reflects microwaves, ensuring they stay inside the microwave oven to heat the food effectively. The metal walls and door of the microwave help contain the electromagnetic waves produced by the microwave oven, preventing them from escaping and generating heat.
cheese
One of the things that metal sides do is reflect the microwaves confined to where the food is. There is a body of information that lists the damage that leaking microwaves do to people
I don't believe any metal is safe in a microwave.
Metal objects can block microwaves from penetrating through other objects.
Microwaves can cook any food in a dish unless the dish is made out of some kind of metal. The rays that a microwave produce can not penetrate anything that is metal.
no
Glass, ceramics, and most plastics do not absorb microwaves, so they do not heat up in the microwave. Metal, however, reflects microwaves, which can lead to sparking and potentially damage the microwave.
While it is running, it is producing microwaves which is a form of radiation. That is why there is the metal mesh on the door, to block the microwaves and keep them in the oven. The metal shell of the unit keep the microwaves from getting out. It is not radioactive by itself and does not have anything inside it that is.