Join ExamsbookAnswer : 2. "rough black"
Hot water is poured simultaneously in four metallic tumblers painted outside with different points. After some time the water will be found to have cooled most in the tumbler painted.5
Q: Hot water is poured simultaneously in four metallic tumblers painted outside with different points. After some time the water will be found to have cooled most in the tumbler painted.
- 1rough whitefalse
- 2rough blacktrue
- 3shining whitefalse
- 4shining blackfalse
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Answer : 2. "rough black"
Explanation :
Answer: B) rough black Explanation: Black surfaces are good emitters of heat ( They are also good absorbers of heat). If the black surface is rough too, the emitting will be better. So (b) is the correct answer. Shining surfaces reflect back radiation. So if the black surface is also shining the effectiveness of emitting heat is lessened.
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