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"A solid sphere of copper of radius R an...

"A solid sphere of copper of radius R and a hollow sphere of the same material of inner radius r and outer radius R are heated to the same temperature and allowed to cool in the same environment. Which of them starts cooling faster ?''

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To determine which sphere starts cooling faster, we need to analyze the properties of both the solid sphere and the hollow sphere. We will consider their masses, surface areas, and the principles of thermal radiation. ### Step-by-Step Solution: 1. **Identify the Properties of the Spheres**: - **Solid Sphere**: Radius = R - **Hollow Sphere**: Inner Radius = r, Outer Radius = R ...
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