(II) (a) How much power is radiated by a tungsten sphere(emissivity e = 0.35) of radius 19 cm at a temperature of25°C? (b) If the sphere is enclosed in a room whose wallsare kept at –5°C, what is the net flow rate of energy out ofthe sphere?

The expression for the power radiated by a tungsten sphere, P=ϵσAT4=ϵσ4πr2T4

Answered: (II) (a) How much power is radiated by…

University Physics Volume 2

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Chapter1: Temperature And Heat

Section: Chapter Questions

Problem 17CQ: Can carbon dioxide be liquefied at room temperature (20 If so, how? If not, why not? (See the phase...

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One might think that the internal energy of diatomic gases is given by Eint=5RT/2 . Do diatomic gases near room temperature have more or less internal energy than that? Hint: Their internal energy includes the total energy added in raising the temperature from the boiling point (very low) to room temperature.
Two moles of nitrogen gas, with =7/5 for ideal diatomic gases, occupies a volume of 102 m3 in an insulated cylinder at temperature 300 K. The gas is adiabatically and reversibly compressed to a volume of 5 L. The piston of the cylinder is locked in its place, and the insulation around the cylinder is removed. The heat-conducting cylinder is then placed in a 300-K bath. Heat from the compressed gas leaves the gas, and the temperature of the gas becomes 300 K again. The gas is then slowly expanded at the fixed temperature 300 K until the volume of the gas becomes 102 m3, thus making a complete cycle for the gas. For the entire cycle, calculate (a) the work done by the gas, (b) the heat into or out of the gas, (c) the change in the internal energy of the gas, and (d) the change in entropy of the gas.
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(II) (a) How much power is radiated by a tungsten sphere (emissivity e = 0.35) of radius 19 cm at a temperature of 25°C? (b) If the sphere is enclosed in a room whose walls are kept at –5°C, what is the net flow rate of energy out of the sphere?