If black wire of platinum is heated, then its colour first appear red, – McqOptions

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1.	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 [MP PMT 1984]
A.	Wien's displacement law
B.	Prevost theory of heat exchange
C.	Newton's law of cooling
D.	None of the above
Answer» B. Prevost theory of heat exchange

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