PDF chapter test TRY NOW

Activity: To find how does the radiation take place in different coloured surfaces?
  
Materials Required:
  1. Tin cans - 2 nos.
  2. 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.
Activity X.jpg
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.