HOTS Science Primary 6 Energy

Two identical beakers, X and Y, were filled with the same amount of water at 30°C. Beaker X was wrapped in a black cloth and Beaker Y was wrapped in a white cloth. Both were placed under a lamp for 30 minutes. What is the most likely reason the water in X became hotter than Y?

A White surfaces are better absorbers of light.
B Black surfaces are better reflectors of heat.
C Black surfaces are better absorbers of heat.
D Heat energy is converted into light energy in Beaker X.
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Worked Solution

Step 1: Dark-coloured surfaces (black) absorb more radiant heat than light-coloured surfaces (white). Step 2: The lamp provides light and heat energy. Step 3: Beaker X absorbs more heat, causing the water temperature to rise faster.

Correct answer: Black surfaces are better absorbers of heat.

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