TEST BANK FOR Quantum Physics 3rd Edition By Stephen Gasiorowicz
Chamberlian School of Nursing
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Exam (elaborations) TEST BANK FOR Quantum Physics 3rd Edition By Stephen Gasiorowicz (Solution manual)
- Exam (elaborations) • 147 pages • 2021
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1. The energy contained in a volume dV is 
U(ν,T)dV = U(ν ,T)r2drsinθ dθdϕ 
when the geometry is that shown in the figure. The energy from this source that emerges 
through a hole of area dA is 
dE(ν ,T) = U(ν ,T)dV 
dAcosθ 
4πr2 
The total energy emitted is 
. 
dE(ν ,T) = dr dθ dϕU(ν,T)sinθ cosθ dA 
0 4π 
2π ∫ 0 
π /2 ∫ 0 
cΔt ∫ 
= dA 
4π 
2π cΔtU(ν ,T) dθ sinθ cosθ 
0 
π / 2 ∫ 
= 1 
4 
cΔtdAU (ν ,T) 
By definition of the emissivity, this is equal to EΔtdA ...
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