Ch. 8 Equations Flashcards
1
Q
Power radiated by a grey body (Stefan-Boltzmann law)
A
Note: For a black body, e = 1.
2
Q
Albedo (of planet)
A
Total scattered power/total incident power
3
Q
Emissivity
A
power per unit area radiated by object / power per unit area radiated by a black body at the same temperature
4
Q
Intensity*
A
Power/area
5
Q
Specific energy (of fuel)
A
Energy per unit mass
6
Q
Energy density (of fuel)
A
Energy per unit volume
7
Q
Maximum power generated by wind turbine
A
P = 1/2ρAv^3
8
Q
Power generated by hydroelectric power station
A
P = mgΔh/Δt or (ρV/Δt)gΔh
9
Q
Wavelength of peak radiation emission of a black body
A
Wavelength (metres) = (2.90 * 10^-3)/T (Kelvin)
10
Q
Emissivity (definition)
A
The ratio of the power per unit area radiated by a body to the power per unit area radiated by a black body at the same temperature.
