hc - 1≈ exp 8. For what values of T is the approximation exp XkBT 9. Use the above approximation to obtain an expression for the ratio of the spectral exitances Mx (₁)/Mx (A₂) and solve for T. hc XkBT
hc - 1≈ exp 8. For what values of T is the approximation exp XkBT 9. Use the above approximation to obtain an expression for the ratio of the spectral exitances Mx (₁)/Mx (A₂) and solve for T. hc XkBT
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Transcribed Image Text:8. For what values of T is the approximation exp{T}
- 1 ≈ exp{T}
9. Use the above approximation to obtain an expression for the ratio of the spectral exitances M₁ (λ₁)/Mx (A2) and solve for T.
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We are given an expression. We are also given approximation for that expression. We have to find when this approximation holds good. Or more clearly, we have to find for what temperatures we can neglect the 1 present in the expression.
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