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GATE 2024 BM – Question 35

Sensors and Bioinstrumentation · Physiological Measurements · 1 mark · Numerical answer

Use Wien’s displacement constant 2.898×10⁻³ m K to find the peak black-body emission wavelength of a human body at 37°C. Give μm to two decimals.

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Correct answer: 9.30 to 9.70

Explanation

Convert temperature to kelvin: T=37+273.15=310.15 K. Wien’s law gives λmax=b/T=2.898×10⁻³/310.15≈9.3439×10⁻⁶ m. This is 9.34 μm to two decimals, in the infrared.

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