The heat source is probably from a flame, an oven, or from an electric stovetop. The metal pan or sheet helps to trap the heat and transfer it to the cookies. If there is too much heat or the heat is applied for too long, the the cookies will burn.
Depends on what you want to use it for. It's good if the base of a frying pan conducts easily as it means it'll heat the contents fast. It's bad if the handle of a frying pan conducts easily as the handle will get too hot to hold and burn you.
Because it conducts heat.
Try spraying the pan. the sugar is the hottest substance in the cookies and the baking sheet has the most concentrated heat so the combination of the sugar and the concentrated heat causes the bottom to burn
Tin pan, because it conducts heat better than a plastic pan.
through radiation
BEANSSSSSSS!!!!!!!!! and hotness also not stiring it enough
One with a copper bottom, copper conducts the heat faster and distributes the heat evenly.
It is good because it conducts heat. Its useful for making jam.
If the pan is darker it attracts more heat so the cookies are done faster. I would recommend using a light pan as they won't be burned too quickly.
Because the stove burner conducts the heat through the pan to cook the food.
they bake faster because there closer to the heat
The metal conducts heat better and will cook the food evenly. A high end metal pan covered with a ceramic finish is one of the best cooking pans you can have. Iron skillets have always been considered a good pan as well, but the iron does realise elements in the food as it cooks.