Four pieces of iron heated in a furnace to different temperatures show different colours listed below. Which one has the highest temperature
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(a) At low temperature short wavelength radiation is emitted. As the temperature rise colour of emitted radiation are in the following order
Red $\to$ Yellow $\to$ Blue $\to$ White (at highest temperature)
Red $\to$ Yellow $\to$ Blue $\to$ White (at highest temperature)
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