Heat transfer mode definition: identify radiation The process of heat transfer from a hotter body to a colder body that travels in straight lines and does not require or disturb the intervening medium is called what? Choose the correct truth value for the given statement.
Mechanical Engineering
Heat Transfer, Refrigeration and Air Conditioning
Difficulty: Easy
Choose an option
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ATrue (this describes thermal radiation)
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BFalse (this does not describe radiation)
Answer
Correct Answer: True (this describes thermal radiation)
Explanation
Concept/ApproachHeat can be transferred by conduction (requires material contact), convection (requires a fluid), and radiation (electromagnetic waves that can travel through vacuum).
Why the statement is correctRadiative transfer proceeds in straight-line paths from a hot surface to a cooler one and does not require an intervening medium; it can occur through vacuum. Any intervening medium may absorb/reflect/emissively participate, but radiation itself does not require the medium.
Common pitfalls
- Confusing radiation with convection; convection needs a moving fluid.
- Assuming radiation needs air; it does not.
Final AnswerTrue