Fused quartz transmits 90 percent of the incident thermal radiation between 0.2 and 4 µm. Suppose a certain heat source is viewed through a quartz window. What heat flux in watts will be transmitted through the material from blackbody radiation sources at (a) 800◦C, (b) 550◦C, (c) 250◦C, and (d ) 70◦C? (Holman, 2002)

Elements Of Electromagnetics
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Fused quartz transmits 90 percent of the incident thermal radiation between 0.2 and 4
µm. Suppose a certain heat source is viewed through a quartz window. What heat flux in
watts will be transmitted through the material from blackbody radiation sources at (a)
800◦C, (b) 550◦C, (c) 250◦C, and (d ) 70◦C? (Holman, 2002)

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