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A piece of iron is heated in a flame. It first becomes dull red then becomes reddish yellow and finally turns to white hot. The correct explanation for the above observation is possible by using [NEET 2013]
  • a)
    Wien’s displacement law
  • b)
    Kirchoff’s law
  • c)
    Newton’s law of cooling
  • d)
    Stefan’s law
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
A piece of iron is heated in a flame. It first becomes dull red then b...
Wein’s displacement law According to this law
or,  λmax × T = constant
So, as the temperature increases λ decreases.
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Most Upvoted Answer
A piece of iron is heated in a flame. It first becomes dull red then b...
The change in colour of the rod on heating is due to the different wavelength for different temperature.The relation between wavelength and temperature is given by wein's displacement law. According to this law, when the temperature of a black body radiator increases ,the overall radiated energy increases.
Temperature and wavelength is related to each by wein's displacement law.
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Community Answer
A piece of iron is heated in a flame. It first becomes dull red then b...
's Law of Radiationb)Stefan-Boltzmann Law of Radiationc)Planck's Law of Radiationd)Kirchhoff's Law of Radiation
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A piece of iron is heated in a flame. It first becomes dull red then becomes reddish yellow and finally turns to white hot. The correct explanation for the above observation is possible by using [NEET 2013]a)Wien’s displacement lawb)Kirchoff’s lawc)Newton’s law of coolingd)Stefan’s lawCorrect answer is option 'A'. Can you explain this answer?
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