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Electricity, Magnetism, Light & Sound

Grade 3 · Building confidence · 8 questions · Version PG-JOS5SL-127M

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

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

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.