Open Question: Why should you preheat the oven?

if pigs are to hippos as black is to white, then what are ovens??

Please help me, i'm getting so frustrated im about to smash things, and i know i can do this but im unable at the moment!!!

Microwave ovens use radiation whose wavelength is 12.5 cm. What is the frequency (Hz) of this radiation?

What is the energy (kJ·mol-1) of this radiation?

Please help me!!!

Why do some recipes require that the oven be preheated? Does it affect the quality of the food?

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