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Question

Iron glows in red colour when it is heated to very high temperature. The reason for this is :
  1. All metals glow in red colour when heated
  2. Heat energy is being converted into light energy
  3. Heat we supply consumes red colour at high temperature
  4. Mechanical energy is being converted into heat energy

A
Heat we supply consumes red colour at high temperature
B
Mechanical energy is being converted into heat energy
C
All metals glow in red colour when heated
D
Heat energy is being converted into light energy
Solution
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Iron glows in red colour when it is heated to very high temperature cause heat energy is being converted into light energy.

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