A body cools in a surrounding which is at a constant temperature of θ0. Assuming that it obeys Newton's law of cooling, its temperature θ is plotted against time t. Tangents are drawn to the curve at the points A(θ=θ1) and B(θ=θ2). These tangents meet the time-axis at angles α1 and α2 as shown in the graph then:


1.  tan α1tan α2=θ2θ1

2.  tan α1tan α2=θ1θ2

3.  tan α1tan α2=θ1-θ0θ2-θ0

4.  tan α1tan α2=θ2-θ0θ1-θ0

Subtopic:  Newton's Law of Cooling |
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