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Types of Thermometres

A piece of ir...

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A piece of iron is heated in a flame. If 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 (a) Stefan's law (b) Wien's displacement law (c) Kirchoff's law (d) Newton's law of cooling

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Q. 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

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Q. A piece of iron is heated till it becomes red-hot. It then becomes soft and is beaten to the desired shape. What kind of changes are observed in this process– reversible or irreversible?

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