MHT CET 2025 Physics question
A rectangular black body of temperature C has surface area 4 cm x 2 cm and rate of radiation is E. If its temperature is increased by C and surface area is reduced to half of the initial value then the rate of radiation is
Answer: (A)
Solution
Stefan's law: rate of radiation . Initial temperature K; after the rise of C the temperature is K, so the temperature factor is . The new rate is . With the area reduced to
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