Standard Science Primary 4 Energy

Siti held a rectangular piece of cardboard in front of a lamp. She rotated the cardboard. What happened to the shadow?

A The shadow became a source of light.
B The shadow always stayed rectangular.
C The shadow changed its shape and size.
D The shadow disappeared.
Show Worked Solution

Worked Solution

Step 1: A shadow matches the cross-section of the object blocking the light. Step [2-9]: Rotating a 3D or 2D object changes the shape it presents to the light source. Step [2-9]: Therefore, the shadow shape will vary.

Correct answer: The shadow changed its shape and size.

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