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If black wire of platinum is heated, then its colour first appear red, then yellow and finally white. It can be understood on the basis of


  1. Wien's displacement law              

  2. Newton's law of cooling

  3. None of the above

  4. Prevost theroy of heat exchange


Solution

The correct option is A

Wien's displacement law              


According to Wein's law λm Tconstant, on heating up to ordinary temperatures, only long wavelength (red) radiation is emitted. As the temperature rises, shorter wavelengths are also emitted in more and more quantity. Hence the colour of radiation emitted by the hot wire shifts from red to yellow, then to blue and finally to white.             

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