PDF chapter test TRY NOW
Activity: To find how does the radiation take place in different coloured surfaces?
Materials Required:
- Tin cans - 2 nos.
- Paint - Black and White
Procedure:
- Take two identical tin cans.
- Paint the outer surface of one black and of the other white (Fig.).
- Fill the two cans used in with the same amount of hot water at the same temperature (say, at 60oC).
- Leave the cans in a room or in a shade.
- Note the temperature of water after 10–15 minutes.
Containers with black and white surface
Does the temperature of water in both the cans fall by the same amount?
. Temperature .
This is because . This suggests that good absorbers are of heat.
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