Recent content by RodB

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    Atmospheric CO2 absorption - actual quantification?

    I understand the science and rationale for assuming that saturation has no limits, but it has not been scientifically proven, certainly not by crude experiments in the 19th and early 20th centuries, or even more thorough analysis in the 40s. Lack of saturation is still conjecture but it is the...
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    Atmospheric CO2 absorption - actual quantification?

    I am not an expert but have studied it a bit. The actual physics of absorption of radiative energy and then converting that absorbed energy to temperature through molecular collision is quite complicated in the overall. Water vapor absorbs much more radiation than CO2 because it has...
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    Have theories been formed yet on how to stop a black hole?

    If one looks at only “normal” physics escape velocity is directly related to the square root of the density and to the radius of the body. If you hold the radius constant (like for the Earth) then escape velocity is determined only by the square root of the density times a constant. But then...
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    Have theories been formed yet on how to stop a black hole?

    This doesn't sound correct as escape velocity is as much related to density as mass.
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    Have theories been formed yet on how to stop a black hole?

    I read in one reference that the "singularity" is actually a Planck length radius, 10-35 m, though this strikes me as a distinction without a difference.
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    Have theories been formed yet on how to stop a black hole?

    I'm not knowledgeable enough to vouch for it but one of the references describes it as the proper time of an in falling object crossing the Event Horizon is zero. Like one outside the EH can stop space movement but not time movement, one inside the EH stops proper time movement but can not stop...
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    Radiative Energy: Debate on Physical Processes

    I'm half understanding. I understanding the emissivity is wavelength dependent and you can get gaps or reduced intensity areas in what otherwise is a "continuous" spectrum. I don't think this refutes my original question. Which, maybe put another way, is what precisely physical is going on...
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    Radiative Energy: Debate on Physical Processes

    Andy Resnick, I think you are saying my original assertion is not correct. I still have to disagree -- at least in part. You can/do get Planck radiation from a gas (cosmic background radiation being a prominent example??); I don't think a filter ala dichroic mirror affects my assertion -- one...
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    Radiative Energy: Debate on Physical Processes

    alxm, I'm don't see how the Boltzmann distribution relates to the quantized discrete absorption. Taking just one (of the only 3 or 4) bands (lines) and ignoring relatively insignificant doppler and pressure "band" spreading, the CO2 molecule absorbs energy at precisely and only roughly 15um...
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    Radiative Energy: Debate on Physical Processes

    I'm currently in a debate elsewhere. I contend that the physical process of absorbing/emitting blackbody type radiation in a continuous spectrum is strictly a function of temperature, mitigated by characteristic of the substance called emissivity; and the absorption/emission of infrared...
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    Multi-angular Momenta: Q re Angular Momentum (L)

    Thanks, rohanprabhu So, in the same frame linear momentum is fixed (sans any force) and constant no mater how one looks at it. Angular momentum (again in a same frame) of any particular mass is relative to whatever axis one chooses to relate it to. It shouldn't have been that hard! Slap...
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    Multi-angular Momenta: Q re Angular Momentum (L)

    I have a Q re angular momentum (L) that's causing some heated discussion. A bullet is fired off center toward a rotatable target with an axis from, say, 100m (like a ballistic pendulum). The bullet has a fixed linear momentum and an L that remains constant as it travels toward the target --...
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    How does potential energy relate to work and forces in a lifting elevator?

    spaceship I'll try #1, but it seems too obvious, so maybe wrong :smile: . When the ship was put in orbit it had to have been given (just the right amont of) angular momentum. That angular momentum has to be conserved which would maintain the rotational part of the trajectory. The up/down...
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    Black Body / Emission difference ?

    Another follow-up: it's clearly implied here that gases can and do emit blackbody-type radiation -- Do they? I've been having a debate on a climate blog -- some say yes, some say yes but only under very high pressure (I asked what's the pressure of the Universe background radiation), some say...
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    Black Body / Emission difference ?

    A related question(s): 1) A drop in electron energy level emits photons; is the energy level rise caused only by photon absorption, or can that energy come from something else, like heat? 2) I understand that ionization does not work the same way -- ala photon emission/absorption: correct...
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