- Heat Transfer - Section 1
- Heat Transfer - Section 2
- Heat Transfer - Section 3
- Heat Transfer - Section 4
- Heat Transfer - Section 5
- Heat Transfer - Section 6
- Heat Transfer - Section 7
- Heat Transfer - Section 8
- Heat Transfer - Section 9
- Heat Transfer - Section 10
- Heat Transfer - Section 11


Heat Transfer - Engineering
Q1: The absorptivity of a grey body at a given temperature __________ with increasing wavelength of radiation.A increases
B decreases
C remains constant
D may increase or decrease ; depends on the material
ANS:D - may increase or decrease ; depends on the material The absorptivity of a grey body at a given temperature generally remains constant with increasing wavelength of radiation. A grey body is defined as a surface that absorbs all radiation incident upon it, regardless of wavelength, and emits radiation according to Planck's law. The absorptivity of a grey body is independent of wavelength, meaning it absorbs radiation equally across the entire electromagnetic spectrum. Therefore, the correct option is: remains constant. |


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