Perfect black body: select the correct defining property. Among the listed statements, identify the defining characteristic of an ideal black body in radiation heat transfer. Choose the correct option.
Mechanical Engineering
Heat Transfer, Refrigeration and Air Conditioning
Difficulty: Easy
Choose an option
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Ais black in colour
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Babsorbs heat radiations of all wavelengths falling on it
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Creflects all the heat radiations
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Dtransmits the heat radiations
Answer
Correct Answer: absorbs heat radiations of all wavelengths falling on it
Explanation
DefinitionAn ideal black body has absorptivity = 1 for all wavelengths and directions; it absorbs all incident radiation. Colour in the visible spectrum is irrelevant to the idealized definition.
Final Answerabsorbs heat radiations of all wavelengths falling on it.