Question

Ram made two solar cookers-one with its interior walls painted black and having a glass lid and the other with its interior walls painted white and without a glass lid. which will be more efficient and why?

Answer 1

The solar cooker with walls painted black and a glass lid will be the more efficient one because firstly the glass lid will prevent the transfer of heat by convection ; secondly black color absorbs the maximum amount of radiation and also reflects back maximum amount of radiation therefore the equilibrium temperature of black walls will be higher than those of white walls