### What are the quantum mechanisms behind the emission

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What are the quantum mechanisms behind the emission and absorption of thermal radiation at and below room temperature? If the relevant quantum state transitions are molecular (stretching, flexing and spin changes) how come the thermal spectrum is continuous? What about substances (such as noble gases) which don't form molecules, how do they emit or absorb thermal radiation? Are there a semi-classical mechanism (with the EM field treated classically) and also a deeper explanation using the full apparatus of QFT?

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 The air above the gasoline has an absolute pressure : An 80-m-tall sealed tank contains a 70-m-tall column of gasoline. The air above the gasoline has an absolute pressure of 3 atm. At what speed does the liquid begin to flow out during a hole located 20 m above the bottom of the tank? Early extinguishment of debt : Early extinguishment of debt. What is the companys cost of capital : How much importance should be given to the energy cost situation and what are the project's cash flows for the next twenty years? What assumptions did you use - what is the companys cost of capital? What is the unit cost of the product manufactured : A. determine the overhead rate that should be used for each department in applying over overhead cost to job number 399 What are the quantum mechanisms behind the emission : What are the quantum mechanisms behind the emission and absorption of thermal radiation at and below room temperature? If the relevant quantum state transitions are molecular (stretching, flexing and spin changes) how come the thermal spectrum is con.. Decide the speed a proton of charge : Decide the speed a proton of charge +e should move towards a stationary nucleus of charge +e (we presume the nucleus doesn't move) so it is able to get within 1.0e-15 m before stopping Direction of the electric field and the normal to surface : A circular surface with a radius of 0.068 m is exposed to a uniform electric field of magnitude 1.43×104 N/C. The electric flux during the surface is 60 N·m2/C. What is the angle among the direction of the electric field and the normal to the surface.. Abruptly added to one end and allowed to oscillate freely : What is the natural frequency in (a) rad/ sec and (b) hertz of a spring- mass system if the spring constant id 25 N/m and a 100g mass is abruptly added to one end and allowed to oscillate freely? Find the change in the kinetic energy of the merry-go-round : A 38-kg boy running at 3.7m/s jumps tangentially onto a small circular merry-go-round of radius 2.0 m and rotational inertia 20 kg m2 pivoting on a frictionless bearing on its central shaft. Merry-go-round initially rotating at 0.70 rad/s opposite th..

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