Why does object appears red when heated up?
Ans: Any substance above absolute zero temperature (-2730C) glows. The glow of the substance cannot be perceived as the emitted photons are not in the visible range.
When a body is heated, the energy of the electrons increases. As the energy increases, the photons that are emitted fall in the wavelength of the visible spectrum. Initially, the object is emitting infra-red radiation invisible to the naked eye. When the emitted photons get more energy, they reach the red region of the visible spectrum.
When a body is heated, the energy of the electrons increases. As the energy increases, the photons that are emitted fall in the wavelength of the visible spectrum. Initially, the object is emitting infra-red radiation invisible to the naked eye. When the emitted photons get more energy, they reach the red region of the visible spectrum.
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