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Electricity, Magnetism, Light & Sound

Grade 3 · Building confidence · 8 questions · Version PG-1A3PAKO-127M

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1.How do you see an object?
2.What do like magnetic poles do?
3.What do opposite magnetic poles do?
4.What happens to pitch as frequency rises?
5.What energy change occurs in a speaker?
6.What does a switch control?
7.What can happen when light enters water?
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. What do like magnetic poles do?Repel
  3. What do opposite magnetic poles do?Attract
  4. What happens to pitch as frequency rises?Pitch becomes higher
  5. What energy change occurs in a speaker?Electrical energy becomes sound
  6. What does a switch control?Whether a circuit is open or closed
  7. What can happen when light enters water?It refracts, or bends
  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.