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What is the principle of working of solar cooker? Write two major drawbacks of all solar heating devices. |
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Answer» Principle of working of solar cooker: The glass sheet placed in the box alloes the sun heat (rays) to be absorbed by the black surface of box but does not allow the heat so absorbed to leave the box easily. This is because the glass has the peculiar properly to pass through it only such infrared radiations which have wavelength near to visible light. It does not allow infrared radiations of higher wavelength to come out of the solar cooker. Thus the temperature. Now the wavelength of infrared radiations inside the box is higher than those from outside. Hence, heat from the box does not pass out through glass sheet. Further inside black of the cooker absorb maximum heat. Major Disadvantages: 1. Solar energy is available in highly diffused focus. 2. Proper devices to concentrate and store solar energy are not available as yet. |
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