Question: A semi - infinite steel rod with a thermal diffusivity of 1 . 2 1 0 - 5 m 2 s is initially at 2

A semi-infinite steel rod with a thermal diffusivity of 1.210-5m2s is initially at 25C. The temperature at one end of the rod is suddenly increased to 100C.
a) What will be the local temperature at a point 10 cm away from the end of the rod after 5 minutes?
b) How long will it take for the local temperature at a point 1 cm away from the end of the rod to reach 75C?

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