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A student makes a solar water heater using a hosepipe - Edexcel - GCSE Physics - Question 2 - 2011 - Paper 1
Question 2
A student makes a solar water heater using a hosepipe. He paints the hosepipe black and fills it with water. He coils the hosepipe and fixes it into an open metal bo... show full transcript
Worked Solution & Example Answer:A student makes a solar water heater using a hosepipe - Edexcel - GCSE Physics - Question 2 - 2011 - Paper 1
Step 1
Complete the sentence by putting a cross (✗) in the box next to your answer.
Answer
The hosepipe is painted black because blackened surfaces are C good absorbers of radiation. Black surfaces are effective in absorbing heat energy from the Sun, which aids in heating the water inside the hosepipe.
Step 2
Suggest two changes to the box which would increase the constant temperature reached.
Answer
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Insulation: Adding insulation around the metal box would reduce heat loss, allowing the temperature to remain constant for a longer period.
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Glass Cover: Placing a glass cover over the box would trap heat and create a greenhouse effect, increasing the internal temperature by preventing heat from escaping.