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Questions and Answers
What is used to express the time of day in solar energy calculations?
What is used to express the time of day in solar energy calculations?
- Mean Solar Time (MST)
- Apparent Solar Time (AST) (correct)
- Local Standard Time (LST)
- Daylight Saving Time (DST)
What is the time when the sun crosses the meridian of the observer called?
What is the time when the sun crosses the meridian of the observer called?
- Equation of Time (ET)
- Longitude Correction Time
- Mean Solar Noon
- Local Solar Noon (correct)
What factor causes the Equation of Time (ET) variation throughout the year?
What factor causes the Equation of Time (ET) variation throughout the year?
- Earth's inner core temperature
- Earth's orbital eccentricity (correct)
- Earth's tilt angle
- Earth's rotation speed
Why does Apparent Solar Time (AST) differ slightly from mean time kept by a clock?
Why does Apparent Solar Time (AST) differ slightly from mean time kept by a clock?
What must be used to convert Local Standard Time (LST) to Apparent Solar Time (AST)?
What must be used to convert Local Standard Time (LST) to Apparent Solar Time (AST)?
Which factor contributes to the non-uniform length of a day throughout the year?
Which factor contributes to the non-uniform length of a day throughout the year?
What is the significance of the plus sign in Eq (2.4) when calculating the sun-earth distance?
What is the significance of the plus sign in Eq (2.4) when calculating the sun-earth distance?
How is the mean sun-earth distance, 'a', defined?
How is the mean sun-earth distance, 'a', defined?
What is the approximate percentage difference between the longest and shortest sun-earth distances?
What is the approximate percentage difference between the longest and shortest sun-earth distances?
In which season is the sun higher in the sky according to common knowledge?
In which season is the sun higher in the sky according to common knowledge?
How often does the earth move around the sun in an elliptical orbit?
How often does the earth move around the sun in an elliptical orbit?
What does the equation R = a(1 - e) represent?
What does the equation R = a(1 - e) represent?
What is the name of the equation derived by Max Planck to describe the monochromatic emissive power of a blackbody?
What is the name of the equation derived by Max Planck to describe the monochromatic emissive power of a blackbody?
What does the constant C1 represent in Planck's equation for blackbody radiation?
What does the constant C1 represent in Planck's equation for blackbody radiation?
How is the equation (2.34) modified when the surface is not in a vacuum or a gas?
How is the equation (2.34) modified when the surface is not in a vacuum or a gas?
What type of surfaces are often considered as diffuse reflectors in engineering calculations?
What type of surfaces are often considered as diffuse reflectors in engineering calculations?
What does Wien's displacement law provide?
What does Wien's displacement law provide?
A real surface is both a diffuse emitter and a diffuse reflector. What does this imply about the radiosity of the surface?
A real surface is both a diffuse emitter and a diffuse reflector. What does this imply about the radiosity of the surface?
Which constant is used to calculate C2 in Planck's equation for blackbody radiation?
Which constant is used to calculate C2 in Planck's equation for blackbody radiation?
What is the equation used for a real surface to calculate the intensity of radiation from it?
What is the equation used for a real surface to calculate the intensity of radiation from it?
What does C2 represent in Planck's equation for blackbody radiation?
What does C2 represent in Planck's equation for blackbody radiation?
In Example 2.10, what is the transmissivity of the glass used in the application for wavelengths 0.3 and 3.0 mm?
In Example 2.10, what is the transmissivity of the glass used in the application for wavelengths 0.3 and 3.0 mm?
What percentage of incident solar energy is transmitted through the glass for wavelengths between 0.3 and 3.0 mm?
What percentage of incident solar energy is transmitted through the glass for wavelengths between 0.3 and 3.0 mm?
Based on the provided text, what is the primary assumption made about the interior of the application mentioned in Example 2.10?
Based on the provided text, what is the primary assumption made about the interior of the application mentioned in Example 2.10?
What is the total emissive power of the surface when the average emissive power over the entire wavelength is given as 0.4432?
What is the total emissive power of the surface when the average emissive power over the entire wavelength is given as 0.4432?
At a temperature of 2500 K, what is the computed value of Eb for the given surface?
At a temperature of 2500 K, what is the computed value of Eb for the given surface?
What is the average absorptivity of the surface when the spectral absorptivity values are 0.2 and 0.7 for different wavelengths?
What is the average absorptivity of the surface when the spectral absorptivity values are 0.2 and 0.7 for different wavelengths?
Based on the Kirchhoff's law, if a(T) = 0.383, what is the reflectivity (r) of the surface?
Based on the Kirchhoff's law, if a(T) = 0.383, what is the reflectivity (r) of the surface?
At a temperature of 2500 K, what is the computed value of ε(T) based on Eq.(2.41) and the provided average absorptivity value?
At a temperature of 2500 K, what is the computed value of ε(T) based on Eq.(2.41) and the provided average absorptivity value?
What law is used to obtain other properties of materials as demonstrated in Example 2.12?
What law is used to obtain other properties of materials as demonstrated in Example 2.12?
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