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Heat Transfer P1

QuestionAnswer
Where on an object i heat radiation emitted from? The surface
Why does surface area increase radiation? Because more infrared waves can be emitted from the surface and so heat transfer is quicker
Give two uses of increasing surface area to increase radiation. • Radiators have large surface areas to maximise heat transfer • Car have large fins so heat radiates and engine cools quicker
What happens if two objects, one with a large volume and the other with a small volume, at the same temperature radiate? The object with the smaller volume will radiate heat and cool quicker because a higher proportion of its surface is in contact with its surroundings
How can the type of material affect rate of heat transfer? An object in contact with a good conductor will radiate more heat than an object in contact with a good insulator
In a vacuum flask, which features stop: a) Conduction (3) b) Convection (1) c) Radiation (1)? a) Double walled with vacuum, insulating foam and plastic stopper filled with cork b) Double walled with vacuum c) Silver wall
Why do arctic foxes have small ears? To minimise heat loss by radiation due to surface area
Why do desert foxes have huge ears? To allow them to lose heat due to large surface area to keep cool
Created by: GuyBrazier