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Electricity, Magnetism, Light & Sound

Grade 3 · Building confidence · 8 questions · Version PG-1AXO3NL-127M

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1.What can happen when light enters water?
2.Why can you hear an echo?
3.What energy change occurs in a speaker?
4.What do opposite magnetic poles do?
5.How do you see an object?
6.Why does a shadow form?
7.What happens to pitch as frequency rises?
8.What do like 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 14
  1. What can happen when light enters water?It refracts, or bends
  2. Why can you hear an echo?Sound reflects from a surface
  3. What energy change occurs in a speaker?Electrical energy becomes sound
  4. What do opposite magnetic poles do?Attract
  5. How do you see an object?Reflected light enters your eyes
  6. Why does a shadow form?An object blocks light
  7. What happens to pitch as frequency rises?Pitch becomes higher
  8. What do like magnetic poles do?Repel

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.