Advanced Science Primary 4 Energy

Ross wants to find out if the thickness of a material affects the amount of light passing through it. Which variables must be kept the same?

A Light source and thickness.
B Distance from torch and thickness.
C Type of material and light source.
D Type of material and thickness.
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Worked Solution

Step 1: Identify the independent variable (Thickness). Step 2: In a fair test, all other variables must be constant. Step 3: The material type and light source intensity must remain the same.

Correct answer: Type of material and light source.

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