- #1
treddie
- 91
- 2
Hello, and thank you for taking the time to read my question.
I know this is a posting with multiple questions, but I would be perfectly fine if instead of answering all of the questions, someone could steer me to a book or online sources of information that cover these questions. So far, I have been unable to find any online sources that do this.
Suppose that a hollow box is made of perfectly insulating sides so that no heat can escape. Inside the box is a gas at some pressure and say 0deg C. Also in the box is a heating element shaped like a 2-dimensional square, where only one side emits radiation. I have two questions about this setup. If I say that the heating element is radiating energy at 100 deg C, as measured by a temperature sensing "gun", then does this mean that every particle of the heating element is radiating at 100 deg, or does it mean that OVERALL, the heating element is at 100 deg? In other words, if I were to take the heating element and cut it into 10 smaller squares, would they each radiate 10 deg of heat, or each 100 deg of heat?
My second question is that since the heater is emitting radiation constantly at 100 deg, and once all of the atoms of the gas in the box all reach equilibrium at 100 deg, does this mean that the heat radiated from the heater can no longer raise the temperature of the gas above 100 deg? In other words, are the photons of the heat radiation simply reflected off of the atoms of the gas, (not absorbed/re-emitted). If not where do the photons go when the box is perfectly insulated? They are increasing in number, are they not?
Thank you very much,
Tom Reddie
I know this is a posting with multiple questions, but I would be perfectly fine if instead of answering all of the questions, someone could steer me to a book or online sources of information that cover these questions. So far, I have been unable to find any online sources that do this.
Suppose that a hollow box is made of perfectly insulating sides so that no heat can escape. Inside the box is a gas at some pressure and say 0deg C. Also in the box is a heating element shaped like a 2-dimensional square, where only one side emits radiation. I have two questions about this setup. If I say that the heating element is radiating energy at 100 deg C, as measured by a temperature sensing "gun", then does this mean that every particle of the heating element is radiating at 100 deg, or does it mean that OVERALL, the heating element is at 100 deg? In other words, if I were to take the heating element and cut it into 10 smaller squares, would they each radiate 10 deg of heat, or each 100 deg of heat?
My second question is that since the heater is emitting radiation constantly at 100 deg, and once all of the atoms of the gas in the box all reach equilibrium at 100 deg, does this mean that the heat radiated from the heater can no longer raise the temperature of the gas above 100 deg? In other words, are the photons of the heat radiation simply reflected off of the atoms of the gas, (not absorbed/re-emitted). If not where do the photons go when the box is perfectly insulated? They are increasing in number, are they not?
Thank you very much,
Tom Reddie