Philip Koeck's latest activity
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Philip Koeck reacted to erobz's post in the thread B Physically speaking, what happens in Torricelli’s experiment? with
Like.
You need to do a free body diagram of the mercury column in the tube. From the free surface of the base to the underside of the tube... -
Philip Koeck replied to the thread B Physically speaking, what happens in Torricelli’s experiment?.I think you have it. With the bowl it's just a bit more complicated since the surface area of the mercury in the bowl is different from...
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Philip Koeck reacted to adjurovich's post in the thread B Physically speaking, what happens in Torricelli’s experiment? with Like.
This one seems pretty obvious. We can see that atmosphere is pushing on the left free surface, while at the same elevation on the right...
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Philip Koeck replied to the thread B Physically speaking, what happens in Torricelli’s experiment?.I think it might be easier to discuss if you refer to the picture below since you can clearly see which forces are balanced. Give it a try.
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Philip Koeck replied to the thread B Physically speaking, what happens in Torricelli’s experiment?.Think of the force pushing the mercury up into the tube and the force pulling it down. I think it's simpler with the situation in the...
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Philip Koeck reacted to Lord Jestocost's post in the thread I Radiation from solid black bodies with Like.
The spectral radiant exitance at the aperture in a cavity (the Planck blackbody radiant exitance) can only approximately be “mimicked”...
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Philip Koeck reacted to pines-demon's post in the thread I Radiation from solid black bodies with Like.
Ok, I do not know how useful is this but let me try to explain it. The problem of an object emitting radiation without being in thermal...
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Philip Koeck reacted to hutchphd's post in the thread I Radiation from solid black bodies with Like.
Thephoton that exists in your head and the photon that is the fundamental excitation of the quantized EM field are rather different...
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Philip Koeck reacted to pines-demon's post in the thread I Radiation from solid black bodies with Like.
Maybe what you need is a good reference on how to derive heat transfer between two objects, then you will see that Planck's law gives...
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Philip Koeck replied to the thread I Radiation from solid black bodies.That wouldn't work for me, I'm afraid.
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Philip Koeck reacted to pines-demon's post in the thread I Radiation from solid black bodies with Like.
How comfortable are you with statistical field theory? The exact full quantum calculation can get as ugly as you can imagine... (However...
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Philip Koeck reacted to Charles Link's post in the thread I Radiation from solid black bodies with Like.
The reason the small aperture is placed in the box with the cavity is that then we have very nearly unity emissivity by Kirchhoff's law...
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Philip Koeck reacted to hutchphd's post in the thread I Radiation from solid black bodies with Like.
I think this topic is covered in every introductory sophomore "Modern Physics" text (like Eisberg or Tipler). One problem is to provide...
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Philip Koeck replied to the thread I Radiation from solid black bodies.Actually I wasn't asking about real objects. My question was how we can know that a formula that was derived for the radiation emitted...
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Philip Koeck reacted to PeterDonis's post in the thread I Radiation from solid black bodies with Like.
Again, this was a heuristic used in Planck's time to derive the density of states for the EM field (note that it was not limited to the...
