Based on the diagram that was drawn by Allison to illustrate radiation, the labels that should replace the X and Y is hot and cold.
Radiation simply means the emission or the transmission of energy in the form of particles or waves through space.
From the complete question, it should also be known that radiation is the energy that comes from a source and then travels through space at the speed of light. From the diagram that was drawn by Allison to illustrate radiation, the labels that should replace the X and Y is hot and cold.
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