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Question

When an iron rod is heated in a furnace, the colour of the iron rod first turns dull red and on further increase in temperature it changes to bright red to orange, then yellow, progressively white and then finally blue at the elevated temperatures.
This sequence of colours observed on heating an iron rod are in the sequence of __________


A
Increasing wavelength
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B
Decreasing wavelength
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C
Decreasing frequency
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D
None of the above
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