A black body is at 2880 K. Let U₁ be the energy emitted between 499 and 500 nm, U₂ between 999 and 1000 nm, and U₃ between 1499 and 1500 nm. Wien's constant is b=2.88×10⁶ nm K. Which statement is correct?
Options

Question

A black body is at 2880 K. Let U₁ be the energy emitted between 499 and 500 nm, U₂ between 999 and 1000 nm, and U₃ between 1499 and 1500 nm. Wien's constant is b=2.88×10⁶ nm K. Which statement is correct?

Options

G1 Physics · Accepted Answer

Use Stefan-Boltzmann law P=eσA(T⁴−Tₛ⁴), Wien's law λₘT=b, or Newton's law of cooling dθ/dt=−k(θ−θₛ), as applicable. Evaluating the given data/statements gives U₂>U₁. Therefore the correct answer is D.