A metallic sphere having radius 0.08 m and mass m = 10kg is heated to a temperature of 227°C and suspended inside a box whose walls are at a temperature of 27°C. The maximum rate at which its temperature will fall is:-
(Take e = 1, Stefan’s constant σ = 5.8 x 10 -8 Wm -2 K -4 and specific heat of the metal s = 90 cal/kg/deg J = 4.2 Joules/Calorie)
Text Solution
Verified by ExpertsThe correct answer is:
B
= 
Rate of temperature fall will be maximum when (T 4 – T S 4 ) has mass value i.e. T has max. value
= 
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