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Electricity, Magnetism, Light & Sound

Grade 3 · Building confidence · 8 questions · Version PG-19TPOVP-127M

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

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 18
  1. What can happen when light enters water?It refracts, or bends
  2. How do you see an object?Reflected light enters your eyes
  3. What happens to pitch as frequency rises?Pitch becomes higher
  4. What does a switch control?Whether a circuit is open or closed
  5. Name a good electrical conductor.Copper
  6. Why can you hear an echo?Sound reflects from a surface
  7. What do like magnetic poles do?Repel
  8. What energy change occurs in a speaker?Electrical energy becomes sound

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.