A ceramic furnace wall may be approximated as a perfect blackbody surface of area
PHYSICS · Multi-part · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter
Problem
A ceramic furnace wall may be approximated as a perfect blackbody surface of area 0.20m2. Initially it operates at 1200K, but during a controlled heat-up its temperature is to be raised to 1800K.
(a) Sketch qualitatively, on the same set of axes, the spectral intensity curves corresponding to the two temperatures, clearly indicating the direction of any shifts in both peak position and overall intensity.
(b) Calculate the peak wavelength at each temperature. (Take b=2.9×10−3mK.)
(c) Determine the factor by which the total radiant power emitted by the wall increases as the temperature changes from 1200K to 1800K. (Take σ=5.67×10−8Wm−2K−4.)
(d) Find the additional radiant power (in kW) delivered to the surroundings due to the temperature increase.
(e) Explain briefly how the perceived colour of the radiation leaking through a small inspection hole would change during the heat-up process.