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Electricity, Magnetism, Light & Sound

Grade 3 · Building confidence · 8 questions · Version PG-IKTR0P-127M

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1.What do like magnetic poles do?
2.What energy change occurs in a speaker?
3.Why can you hear an echo?
4.What does a switch control?
5.Name a good electrical conductor.
6.What happens to pitch as frequency rises?
7.How do you see an object?
8.What do opposite magnetic poles do?

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

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.