The emissivity of a tungsten filament can be approximated to be 0.5 for radiation at wavelengths less than 1 μm and 0.15 for radiation at greater than 1 uum. Determine the average emissivity of the filament at (a) 1500 K and (b) 2500 K. Also, determine the absorptivity and reflectivity of the filament at both temperatures.
The emissivity of a tungsten filament can be approximated to be 0.5 for radiation at wavelengths less than 1 μm and 0.15 for radiation at greater than 1 uum. Determine the average emissivity of the filament at (a) 1500 K and (b) 2500 K. Also, determine the absorptivity and reflectivity of the filament at both temperatures.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:12. The emissivity of a tungsten filament can be approximated to be 0.5 for radiation at wavelengths less than
1 μm and 0.15 for radiation at greater than 1 μm. Determine the average emissivity of the filament at (a) 1500
K and (b) 2500 K. Also, determine the absorptivity and reflectivity of the filament at both temperatures.
13. A small circular plate has a diameter of 2 cm and can be approximated as a blackbody. To determine the
radiation from the plate, a radiometer is placed normal to the direction of viewing from the plate at a distance
of 50 cm. If the radiometer measured an irradiation of 85 W/m 2 from the plate, determine the temperature of
the plate.
14. A small body is placed inside a spherical stainless steel chamber with a diameter of 3 m. The chamber is
evacuated and has a constant surface temperature of 500 K. Determine the radiation incident on the surface of
the small body inside the chamber if the interior surface of the chamber is (a) coated black and (b) well
polished.
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