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Heat and Mass Transfer
Solutions Manual
Second Edition
This solutions manual sets down the answers and solutions for the Discussion Questions, Class
Quiz Questions, and Practice Problems. There will likely be variations of answers to the
discussion questions as well as the class quiz questions. For the practice problems there will
likely be some divergence of solutions, depending on the interpretation of the processes,
material behaviors, and rigor in the mathematics. It is the author’s responsibility to provide
accurate and clear answers. If you find errors please let the author know of them at
[email protected].
Chapter 6
Discussion Questions
Section 6-1
1. Does all electromagnetic radiation travel at the speed of light?
Light is a form of electromagnetic radiation and it seems to be true that all
electromagnetic radiation travels at the speed of light.
2. What is diffuse radiation?
Radiation which travels outward from a surface uniformly in a hemisphere is
called diffuse radiation.
3. Why is spectral intensity not diminished by the distance from the source of radiation?
Spectral intensity refers to radiation affected by temperature and wavelength or
frequency and not by distance from the source. Therefore it is not diminished by
the distance from the source.
4. Define the solid angle.
The solid angle is a three dimensional construction of a cone beginning at a
point and encloses a normal, orthogonal, or perpendicular area. The solid angle
is the area divided by the distance that area is from the starting point;
sometimes called the inverse square law because it is quantified by the normal
area divided by the distance squared. Any area other than a differential area will
be a uniform convex surface from the point source. The unit of the solid angle is
the steradian.
Section 6-2
5. What is a black body?