Heat TransferHard

Question

If a piece of metal is heated to temperature θ and then allowed to cool in a room which is at temperature θ0 the graph between the temperature T of the metal and time t will be closed to :

Options

A.
B.
C.
D.

Solution


             
By Newton′s Law of cooling
T = TS + (TH - TS)e-kt
TS → Temp. of surrounding
TH → Temp. of body at t = 0
K → constant
T → Temp. of body at time t
So graph is

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