A large chunk of tissue at 35C with a thermal diffusivity of 1 10 -7 m

Question:

A large chunk of tissue at 35°C with a thermal diffusivity of 1 × 10^-7 m²/s is dropped into iced water. The water is well-stirred so that the surface temperature of the tissue drops to 0 °C at time zero and remains at 0°C at all times. The temperature of the tissue after 4 minutes at a depth of 1 cm is
(a) 5°C

(b) 30°C

(d) 20°C

(e) 10°C

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