Take two plates A and B of same metal. Polish surface of A with black colour and surface
of B with white colour. Take one electric heater and put polished black plate and white
plate on vertical stand in such a way that polished black plate and white plate face the
heater. Ensure that polished plates are equidistant from the heater. Fix one cork each with
wax on the uncoated sides (back side) of the plates. Observe and comment which surface
absorbs heat radiations more quickly; Black Plate Surface or White Plate Surface.
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Answer:
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Explanation:
Contact Us For Solved NIOS Assignment/Notes/TMA/Practical File
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Delhi
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The black plate surface absorbs heat radiations more quickly than the white plate surface.
Explanation:
- Plate A is polished with black paint, and Plate B is polished with white paint.
- One cork is fixed with wax on the uncoated sides of both plates.
- Both metal plates get the same amount of radiation from the heater since they are similar and placed at the same distance.
- You'll see that the cork on the blackened plate is the first to collapse.
- This is because the black surface absorbs more heat than the white surface.
- This demonstrates that black surfaces are effective heat radiation absorbers.
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