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If I understood well, your metal plate acts as a mirror. Seeing your own image in it is not surprising because what we call "IR" are actually photons. These photons have less energy than visible photons (IR means infra red, i.e. "energy below the energy of red photons") so you can't see them with your eyes. They are emitted by any hot object (that explains ...


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The method of modelling the chicken as a sphere, as mentioned on your other forum, might work something like this. Model the chicken as a sphere and use the heat equation, treating the surface as your boundary. The way to do this is discussed here. To obtain an approximate thermal diffusivity for a chicken you could use the equations you discovered above, ...


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I think the problem is that while in the first case your differential equation applies to all your domain of interest and you can just use it, in the second situation the DE doesn't apply at x=0. This means you need to solve the DE at the domains $0<x<L/2$ and $-L/2<x<0$ separately, where it does still apply. When applying it to those domains ...



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