Book: Lakhmir Singh & Manjit Kaur - Physics
Chapter: 3. Sources of Energy
Subject: Physics - Class 10th
Q. No. 7 of Very Short Answer Type Questions-Pg-140
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7
Why is the copper tube of a solar water heater painted black from outside?
The copper tube is painted black to improve their ability to absorb thermal energy. Black reflects the least amount of radiation (about 3%) of any color, and therefore absorbs almost all the radiation energy to which it is exposed.
