Question : The characteristic invalid for heat radiation is that it travels
Option 1: in a straight line
Option 2: in all directions
Option 3: with the speed of light
Option 4: heating the medium through which it passes
Correct Answer: with the speed of light
Solution : The correct option is with the speed of light .
The property that does not apply to heat radiation is that it travels at the speed of light. Heat radiation, also known as thermal radiation, is the emission of electromagnetic waves by things as a result of their temperature.
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