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Electricity, Magnetism, Light & Sound

Grade 3 · On-level practice · 8 questions · Version PG-ET01WS-JMEH

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1.How do you see an object?
2.Why can you hear an echo?
3.Why does a shadow form?
4.What happens to pitch as frequency rises?
5.What can happen when light enters water?
6.What does a switch control?
7.What energy change occurs in a speaker?
8.Name a good electrical conductor.

Answers and teaching notes

Use the answers to check the work after the learner finishes. For writing prompts, the guide describes what a strong response should include.

Show answers for version 17
  1. How do you see an object?Reflected light enters your eyes
  2. Why can you hear an echo?Sound reflects from a surface
  3. Why does a shadow form?An object blocks light
  4. What happens to pitch as frequency rises?Pitch becomes higher
  5. What can happen when light enters water?It refracts, or bends
  6. What does a switch control?Whether a circuit is open or closed
  7. What energy change occurs in a speaker?Electrical energy becomes sound
  8. Name a good electrical conductor.Copper

Worked example

Use a model to track energy, forces, and waves through a system.

Common mistake

Assuming energy travels without a path or medium.

Helpful hint

Draw the source, path, interaction, and result.