Engineering, 11.07.2019 04:20 tfyvcu5344
The emissivity of a surface is 0.15 for radiation at wavelengths less than 3 μm and 0.9 for radiation at wavelengths greater than 3 μm. a)-determine the average emissivity of the surface at 5800 k b)-determine the average emissivity of the surface at 300k c)-if kirchoff's law applies, what is the absorptivity of this surface when irradiated with sunlight? d)- would this make a better solar reflector or solar absorber?
Answers: 1
Another question on Engineering
Engineering, 04.07.2019 18:20
Prove the equivalence between the two statements of the 2nd law of thermodynamics (i.e., a violation of one statement leads to the violatio the other statement)
Answers: 2
Engineering, 04.07.2019 19:10
With increases in magnification, which of the following occur? a. the field of view decreases. b. the ambient illumination decreases. c. the larger parts can be measured. d. the eyepiece must be raised.
Answers: 1
Engineering, 04.07.2019 19:10
The maximum shear stress and maximum flexural stress occur at the same location along a beam subjected to a non-uniform bending load. a)-trune b)- false
Answers: 2
Engineering, 04.07.2019 19:10
Asteel wire of 2 mm diameter is fixed between two points located 2 m apart. the tensile force in the wire is 250n, if its density of steel is given by 7830 kg/m3 the fundamental frequency of vibration hz? ?
Answers: 3
You know the right answer?
The emissivity of a surface is 0.15 for radiation at wavelengths less than 3 μm and 0.9 for radiatio...
Questions
Mathematics, 07.12.2020 19:20
Physics, 07.12.2020 19:20
Mathematics, 07.12.2020 19:20
Mathematics, 07.12.2020 19:20
Computers and Technology, 07.12.2020 19:20
Spanish, 07.12.2020 19:20
English, 07.12.2020 19:20
History, 07.12.2020 19:20
Physics, 07.12.2020 19:20
