Out of two solar cookers, one was covered by a plane glass plate and the other was left open. Which of the two solar cookers will be more efficient?

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Solar cooker covered by a plane glass plate

Solar cooker left open

Both are equally efficient

None

answer is A.

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Detailed Solution

Out of two solar cookers, one was covered by a plane glass plate, and the other was left open. A solar cooker covered with a plane glass plate is more efficient than two solar cookers.
The solar cooker covered with a plane glass plate is more efficient. It is because the covered glass plate allows solar radiations of smaller wavelengths to pass through it and heat the food item placed in the container inside the solar cooker but does not allow heat radiations of longer wavelengths emitted by the heated container to pass through it.

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