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A sphere, a cube and a thin circular plate, all made of the same material and having the same mass, are initially heated to a temperature of 3,000°C. Which of these will cool fastest?
A sphere is a perfectly round three-dimensional shape with all points on its surface equidistant from the center. It has no edges or vertices and exhibits symmetry. Common examples include balls and planets. The volume and surface area of a sphere are determined using its radius and mathematical formulas.
Class 11 Physics Chapter 10 Thermal Properties of Matter covers heat transfer methods like conduction, convection and radiation. It explains thermal expansion, specific heat capacity, calorimetry and latent heat. The chapter emphasizes their practical applications and importance in understanding thermal phenomena observed in nature and various scientific processes.
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The rate of cooling depends on the surface area exposed to the environment as heat transfer takes place through a surface. So, for objects of the same material and mass, it follows that
1. Sphere: Has the minimum surface area for the same volume or mass.
2. Cube: Has a moderate surface area compared to the sphere and plate.
3. Thin Circular Plate: Has the largest surface area among the three.
Since the thin circular plate has the largest surface area, it will lose heat fastest and cool the quickest.
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