What property of a material describes how effectively it emits infrared radiation?

What property of a material describes how effectively it emits infrared radiation?

What property of a material describes how effectively it emits infrared radiation? A) Reflectivity   B) Conductivity   C) Emissivity   D) Density Answer: Emissivity What is Emissivity? Emissivity is the property of a material that describes how effectively it emits infrared (thermal) radiation compared to a perfect emitter (blackbody). Value range: 0 to 1 1.0 → perfect emitter (blackbody)  0 → no emission (perfect reflector) In simple words: Higher emissivity = better radiation emission = more accurate thermal reading Real Examples Different materials emit infrared radiation at very different efficiencies, and this behavior is described by a property known as emissivity. Materials with high emissivity are highly effective at emitting thermal energy, making them ideal for accurate infrared temperature measurement. For example, black paint has an emissivity of approximately 0.95, which means it behaves almost like a perfect emitter. This is why black-coated surfaces are often used as reference points…