Question:medium
Sphere of color black, red, white, and yellow are heated to the same temperature. The decreasing order of cooling is:
Sphere of color black, red, white, and yellow are heated to the same temperature. The decreasing order of cooling is:
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Higher emissivity results in faster cooling. Black surfaces have the highest emissivity.
Updated On: Jan 13, 2026
- \(Black > Red > Yellow > White\)
- \(Red > Black > White > Yellow\)
- \(White > Yellow > Red > Black\)
- \(Yellow > White > Red > Black\)
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The Correct Option is A
Solution and Explanation
An object's cooling rate is contingent upon its emissivity. Black surfaces exhibit the highest emissivity, facilitating more effective heat radiation compared to other colors. The cooling sequence, from most rapid to least rapid, is ordered as follows:
\[
\text{Black} > \text{Red} > \text{Yellow} > \text{White}.
\]
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