What is the predominant spectral region of thermal radiation emitted by the human body?
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What is the predominant spectral region of thermal radiation emitted by the human body?

G1 Physics · Accepted Answer

Step 1: Any body at a nonzero absolute temperature emits thermal electromagnetic radiation. Step 2: Human body temperature (~310 K) gives peak λₘₐₓ ≈ (2.9 × 10⁻³ m·K)/310 K ≈ 9.4 μm by Wien's law. Step 3: That wavelength is in the infrared spectrum. Final A. Final answer: (A) The radiation emitted is in the infrared region.