There are two solar energy collectors made up of thin aluminum sheets. They are flat and uncoated. Collector ‘A’ is rectangular measuring 20 cm long and 15 cm wide while collector ‘B’ is circular having 20 cm diameter. If they are kept under mid-day sun for a long time then

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Both the collectors A and B will show nearly the same temperature

Collector A will show a higher temperature than B.

Collector B will show a higher temperature than A.

There will be no rise in the temperature of the two collectors, as they are uncoated.

answer is A.

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Detailed Solution

Concept: Two solar energy collectors consist of flimsy sheets of aluminum. They are uncoated and flat. Collector "A" is round with a 20 cm diameter, whereas collector "B" is rectangular with dimensions of 20 cm long and 15 cm broad.
The characteristics of aluminum include its excellent electrical and thermal conductivity. It is a silvery-white metal with a bluish tint that has a brilliant sheen when it is first cracked. It is not magnetic in nature. It has a high level of corrosion resistance. The metal is odorless, impermeable, highly reflective, and ductile.
A physical quantity, and temperature is dependent on the type of material and is independent of the exposure area. The measurement of temperature is used to determine how cold or hot a substance actually is.
The materials for both collectors are aluminum. Both collectors will absorb heat since they are constructed of aluminum, which is a good conductor of heat and electricity.
As a result, the temperature will be almost the same on both collectors A and B.
∴The temperatures of the two collectors will rise, and by an equal amount.
Hence, option 1 is correct.

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