A large steel ingot, which has been uniformly heated to 750 degree Celsius, is h

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A large steel ingot, which has been uniformly heated to 750 degree Celsius, is hardened by quenching it in an oil bath that is maintained at 25 degree Celsius. What length of time is required for the temperature to reach 600 degree Celsius at a depth of 1 cm? Thermal diffusivity for the steel ingot is 1.21 * 10¯⁵ m²/s. The ingot may be approximated as a flat plate

Options:

A . 4.55 seconds

B . 3.55 seconds

C . 2.55 seconds

D . 1.55 seconds

Answer: Option C
Answer: (c).2.55 seconds

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