6. Assume that an ordinary mercury-in-glass thermometer follows first order dynamics with a time constant of 10 s. It is at a steady state temperature of 0 C. At time t = 0, the thermometer is suddenly immersed in a constant temperature bath at 100 C. The time required (in s) for the thermometer to read 95 C, approximately is (A) 60 (B) 40 (C) 30 (D) 20

6. Assume that an ordinary mercury-in-glass thermometer follows first order dynamics with a time constant of 10 s. It is at a steady state temperature of 0C. At time t=0, the thermometer is suddenly immersed in a constant temperature bath at 100C. The time required (in s) for the thermometer to read 95C, approximately is (A) 60 (B) 40 (C) 30 (D) 20