2.4.3 Test Questions
1. What is definition of the blackbody?
2. What is spectral distribution of the blackbody brightness?
3. What defines the place of spectral brightness maximum?
4. What is the formula for defining the blackbody spectral brightness dependence
on wave number and temperature?
5. Does the value of blackbody brightness temperature change on wavelength?
6. Do maximums of spectral brightness and Planck’s function derivative over
temperature coincide?
7. What parameters does the intensity of the surface heat radiation depend on?
8. Might the surface brightness temperature be equal to its thermodynamic
temperature?
9. Derive the formula for the Planck’s function derivative over temperature.
10. Demonstrate the validity of the Eq. 2.6 using differentiation of the Eq. 2.3 over
wavelength.
2.4.4 Sequential Steps of the Exercise Implementation
1. To study the theory with using additional books, pointed in reference list.
2. To take the three variants of input parameters from the Table 2.1 for computer
programs “F_PLANCK.exe”, “I_RADT.exe”. You can use another set of input
parameters. Take in mind that the program can operate with wavelength
l ! 1.0 mm.
3. To analyze
– the Planck’s function and its derivative over the temperature with using
computer program “F_PLANCK.exe” in chosen spectral ranges;
– the variation of spectral dependence of mentioned functions on temperature;
Results are demonstrated on the screen and output in file “fplanck”.
4. To create plots of Planck’s functions and its derivative of the temperature (with
using Excel)
5. To plot the modeling presentation of the emissivity versus wavelength e(l)
in Excel in chosen wavelength ranges. The emissivity varies within ranges
0.50À0.97. It is necessary to create the table containing not less 25 values, to
plot the emissivity, to approximate the curve with using the polynomial 3rd order
trend line, output the corresponded equation at the plot and to fix values of
polynomial coefficients for using them in the computer program “I_RADT.exe”.
(Call attention to the inverse order of the polynomial and input in program
“I_RADT.exe” coefficients.).
2.4 Practice 1
25
1. What is definition of the blackbody?
2. What is spectral distribution of the blackbody brightness?
3. What defines the place of spectral brightness maximum?
4. What is the formula for defining the blackbody spectral brightness dependence
on wave number and temperature?
5. Does the value of blackbody brightness temperature change on wavelength?
6. Do maximums of spectral brightness and Planck’s function derivative over
temperature coincide?
7. What parameters does the intensity of the surface heat radiation depend on?
8. Might the surface brightness temperature be equal to its thermodynamic
temperature?
9. Derive the formula for the Planck’s function derivative over temperature.
10. Demonstrate the validity of the Eq. 2.6 using differentiation of the Eq. 2.3 over
wavelength.
2.4.4 Sequential Steps of the Exercise Implementation
1. To study the theory with using additional books, pointed in reference list.
2. To take the three variants of input parameters from the Table 2.1 for computer
programs “F_PLANCK.exe”, “I_RADT.exe”. You can use another set of input
parameters. Take in mind that the program can operate with wavelength
l ! 1.0 mm.
3. To analyze
– the Planck’s function and its derivative over the temperature with using
computer program “F_PLANCK.exe” in chosen spectral ranges;
– the variation of spectral dependence of mentioned functions on temperature;
Results are demonstrated on the screen and output in file “fplanck”.
4. To create plots of Planck’s functions and its derivative of the temperature (with
using Excel)
5. To plot the modeling presentation of the emissivity versus wavelength e(l)
in Excel in chosen wavelength ranges. The emissivity varies within ranges
0.50À0.97. It is necessary to create the table containing not less 25 values, to
plot the emissivity, to approximate the curve with using the polynomial 3rd order
trend line, output the corresponded equation at the plot and to fix values of
polynomial coefficients for using them in the computer program “I_RADT.exe”.
(Call attention to the inverse order of the polynomial and input in program
“I_RADT.exe” coefficients.).
2.4 Practice 1
25