Energy Sources Flashcards
What is a San key diagram?
Type of energy diagram that represents energy transfers. Each arrow is proportional to the amount of energy in that section.
What is P?
Radiated power
What is i?
i = intensity
What is A?
A = area
What is the formula for intensity?
I = P/A
What is λmax?
The wavelength at which the intensity is maximum
What is T (Wien’s Law)?
Absolute temperature
What is b?
Wien’s constant (2.9 * 10^-3 mK)
What is the formula for Wien’s displacement law?
λmax = b/T
What is P (sb law)?
Radiated power
What is e (sb law)?
Emissivity of the object ( e=1 for ideal radiator)
What is σ (SB law)?
Stefan’s constant (5.6703 * 10^-8)
What is A (SB law)?
Radiating Area
What is T (SB law)?
Temperature of radiator
What is Tc (SB law)?
Temperature of surroundings
What is the Stefan-Boltzmann Law?
P = eσA(T^4 - Tc^4)
Formula for Emmisivity?
e = power emitted by a radiating object / power emitted by a black-body with the same proportions at the same temperature
What is albedo (a)?
How much of total energy incident on surface is reflected
What is the formula for albedo (between 0 and 1)?
A = energy reflected by the surface / total energy incident on surface