May/June 2026 Paper 21

2026 · 40 questions · 40 parts · 40 marks

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15Thermal Conduction Convection RadiationMedium1 mark
The diagram shows a coal fire heating a room. The arrows X, Y and Z represent three methods of thermal energy transfer.
a room with a coal fire in the fireplace, a chimney, a window and a solid floor; arrow Y is a straight arrow from the fire into the room, arrow X is a curved arrow running from the window across the room towards the fire, and arrow Z runs along the solid floor away from the fire
Which row matches a description of a method of thermal energy transfer to the arrow in the diagram representing this transfer?
results from changes in densityrelies upon molecular lattice vibrations
AXZ
BXY
CYX
DZX