Standard Science Primary 4 Energy

Two identical containers, one painted black and one painted white, were filled with water at 30°C and placed under the sun. Why did the water in the black container reach 40°C faster?

A Both B and C.
B Black surfaces are better absorbers of heat.
C White surfaces reflect heat energy away.
D Black surfaces are good conductors of heat.
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Worked Solution

Step 1: Darker colours absorb more radiant heat from the sun. Step 2: Lighter colours reflect more radiant heat. Step 3: Therefore, the black container gains heat faster than the white one.

Correct answer: Both B and C.

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