Question

Is a metal baking tray a conductor or insulator or a radiator

Answer 1

I would think conductor since it absorbs heat and which is radiation but that's not the question and the heat it absorbs it touches the food which is conduction

Answer 2

The tray is a radiator, b/c it helps the heat transfer/spread throughout the oven while baking something for example. Unlike a conductor, having energy pass through the tray too quickly barely getting any heat directly around the tray. And an Insulator preventing the heat from getting through the metal baking tray at all.     

Hope this helps!   ^ ω ^