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Electricity, Magnetism, Light & Sound

Grade 3 · Building confidence · 8 questions · Version PG-1ADOW9N-127M

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1.Why does a shadow form?
2.What does a switch control?
3.Why can you hear an echo?
4.How do you see an object?
5.What energy change occurs in a speaker?
6.What happens to pitch as frequency rises?
7.What do like magnetic poles do?
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 16
  1. Why does a shadow form?An object blocks light
  2. What does a switch control?Whether a circuit is open or closed
  3. Why can you hear an echo?Sound reflects from a surface
  4. How do you see an object?Reflected light enters your eyes
  5. What energy change occurs in a speaker?Electrical energy becomes sound
  6. What happens to pitch as frequency rises?Pitch becomes higher
  7. What do like magnetic poles do?Repel
  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.