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What is the wavelength of thermal radiation?

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in Food Processing Unit Operations by (110k points)
What is the wavelength of thermal radiation?

(a) 0.1 μm to 1000 μm.

(b) 1 μm to 100 μm.

(c) 0.01 μm to 100 μm.

(d) 0.1 μm to 100 μm.

I got this question in examination.

My question is taken from Heat Radiation in section Heat Transfer Theory of Food Processing Unit Operations

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Correct answer is (d) 0.1 μm to 100 μm.

The explanation: The thermal radiation is the electromagnetic radiation emitted from all the substance that is at non-zero temperature in the wavelength ranging from 0.1 μm to 100 μm. This includes part of ultraviolet rays, all of the visible and infrared rays.

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