A) \[{{400}^{o}}C\]
B) \[{{450}^{o}}C\]
C) \[{{500}^{o}}C\]
D) \[{{550}^{o}}C\]
Correct Answer: C
Solution :
By using \[{{R}_{t}}={{R}_{0}}(1+\alpha t)\] \[3\times {{R}_{0}}={{R}_{0}}(1+4\times {{10}^{-3}}t)\]\[\Rightarrow \,\,t={{500}^{o}}C\].
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