Black-body radiation
Black body radiation refers to the way an idealized object, known as a black body, emits and absorbs energy in the form of electromagnetic radiation. A perfect black body absorbs all incoming radiation and reflects none, appearing completely black. When heated, it emits radiation across a spectrum of wavelengths, which changes depending on its temperature. This phenomenon helps explain how objects glow at different temperatures—like a stove burner or the sun—fundamental for understanding concepts in physics, including thermodynamics and quantum mechanics. It laid the groundwork for quantum theory, helping scientists understand energy at the atomic level.
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Black body radiation refers to the electromagnetic radiation emitted by an idealized object, called a black body, which absorbs all incoming light and heat. When heated, it radiates energy at characteristic wavelengths depending on its temperature. This emission peaks at different frequencies: hotter bodies emit more energy and at shorter wavelengths (like ultraviolet), while cooler bodies emit at longer wavelengths (like infrared). This concept is crucial in understanding thermal radiation, leading to breakthroughs in physics, including quantum mechanics and the development of technologies like infrared cameras and thermal imaging.