Question Bank • QB_SUB_DFE_RAD_001 NAT • 2 Marks

Section 7: Dairy and Food Engineering

Radiation Heat Transfer & Emissivity

Subtopic: Wien displacement law and blackbody radiation

Question Statement:

According to Wien's displacement law ($\lambda_{\text{max}} T = 2898\ \mu\text{m}\cdot\text{K}$), the wavelength of maximum spectral emissive power from an infrared food heating lamp operating at $1449\text{ K}$ (in $\mu$m) is:

Answer Key:

2.0

Step-by-Step Solution & Explanation

$\lambda_{\text{max}} = \frac{2898}{T} = \frac{2898}{1449} = 2.00\ \mu\text{m}$
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