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A block of steel heated to 100° C is left in a room to cool. Which of the curves shown in the figure, represents the correct behaviour?
Curves are smooth flowing lines or shapes that are not straight or angular. They can be open or closed and are found in various forms like circles, arcs and spirals. Curves are essential in geometry, art and design and are widely observed in nature, architecture and everyday objects.
Class 11 Physics Chapter 10 Thermal Properties of Matter explains heat transfer methods like conduction, convection and radiation. It covers concepts like thermal expansion, specific heat capacity, calorimetry and latent heat. The chapter emphasizes practical applications and helps in understanding thermal phenomena observed in nature and various scientific processes relevant to everyday life.
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The steel block cools according to Newton’s Law of Cooling, describing that the cooling rate is dependent on the cooling differences between the subject and the ambient; the curve has to be one of exponential decay.
In figure:
Curve A
It represents the steep and sharp drop, suggesting a rapid cooling.
– Curve B: Indicates a linear cooling trend.
– Curve C: This shows a gradual cooling curve, which is similar to exponential decay.
The correct answer is Curve C, as it curves like one would expect according to Newton’s Law of Cooling.
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