MHT CET Physics question
The rate of emission of heat energy per unit area of an iron ball of radius 10 cm is , then rate of emission of heat energy per unit area by a copper ball of radius 5 cm at same temperature will be (emissivity of both the balls is same)
Answer: (D)
Solution
Energy emitted per unit area per second is , which depends only on emissivity and temperature, not on the radius, so the copper ball also emits
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