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Q110 (CDS-I/2011) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Thermal physics Answer Verified

Half portion of a rectangular piece of ice is wrapped with a white piece of cloth while the other half with a black one. In this context, which one among the following statements is correct?

Result
Your answer: —  Â·  Correct: A
Explanation

The melting of ice under different colored wraps is primarily governed by the principles of albedo and radiation absorption. Albedo is the measure of a surface's ability to reflect sunlight; white surfaces have a high albedo (close to 1), meaning they reflect most incident radiation and absorb very little [2]. Conversely, black surfaces have a low albedo (close to 0), making them excellent absorbers of solar energy [2]. When ice is wrapped in a black cloth, the cloth absorbs the majority of the incoming thermal radiation and transfers this heat to the ice, causing it to melt more easily [1]. In contrast, a white cloth reflects most of the heat away, keeping the ice underneath cooler for a longer duration [2]. Therefore, ice melts faster under a black wrap than under a white one due to the higher rate of heat absorption by darker colors.

Sources

  1. [2] https://mynasadata.larc.nasa.gov/lesson-plans/changing-albedo-lab
  2. [1] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 21: Horizontal Distribution of Temperature > 21. Horizontal Distribution of Temperature > p. 285
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