why when we ligt torch to our hand it appears red coloured?
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Explanation:
Oxygenated blood contains RBC's whose hemoglobin is saturated with Oxygen. Now you must have believed that the Iron (Fe) in Hb, when bonded to Oxygen, forms Iron oxide that is rust, and as rust has a reddish hue, the reason for blood to be red is the Iron in hemoglobin.
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This is because the atoms or molecules making up the material that the light shines upon, interacts with this light by absorbing some frequencies (energy) and emitting others. These frequencies of reflected light are seen by our eyes and translated into color.
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