A mild steel plate 5 cm thick and initially at 40 degree Celsius temperature is suddenly exposed on one side to a fluid which causes the surface temperature to increase to and remain at 90 degree Celsius. Calculate maximum time that the slab be treated as a semi-infinitely bodyFor steel, thermal diffusivity = 1.25 * 10 5 m2/s

A mild steel plate 5 cm thick and initially at 40 degree Celsius tempe

1.	A mild steel plate 5 cm thick and initially at 40 degree Celsius temperature is suddenly exposed on one side to a fluid which causes the surface temperature to increase to and remain at 90 degree Celsius. Calculate maximum time that the slab be treated as a semi-infinitely body For steel, thermal diffusivity = 1.25 * 10 5 m²/s
A.	100 seconds
B.	200 seconds
C.	300 seconds
D.	400 seconds
Answer» C. 300 seconds

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