MHT CET 2024 Physics question
The identical metal spheres (of same surface area) have red, black and white colors and they are heated upto same temperature. They are allowed to cool. Arrange them from maximum rate of cooling to minimum rate of cooling
Answer: (A)
Solution
By Kirchhoff's law, a good absorber of radiation is also a good emitter. A black surface is the best absorber and emitter (emissivity close to 1), a white surface is the poorest (it reflects most radiation), and a red surface lies in between. Since the spheres have the same area and the same
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