A long iron rod initially at a temperature of 20°C has one end dipped in boiling water (100°C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The temperature at a distance 100 mm from the dipped end becomes 40°C at time, t = 200 s. The same temperature is achieved at a distance of 200 mm from the dipped end at time (A) t = 283 s (B) t = 356 s (C) t = 400 s (D) t = 800 s

A long iron rod initially at a temperature of 20°C has one end dipped in

boiling water (100°C) at time, t = 0. The curved surface of the rod is

insulated so that heat conduction is one dimensional in the axial direction.

The temperature at a distance 100 mm from the dipped end becomes 40°C

at time, t = 200 s. The same temperature is achieved at a distance of 200 mm

from the dipped end at time

(A) t = 283 s

(B) t = 356 s

(C) t = 400 s

(D) t = 800 s

by

1 Answer

Answer :

(D) t = 800 s

by

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