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Electricity, Magnetism, Light & Sound

Grade 3 · On-level practice · 8 questions · Version PG-E90UIU-JMEH

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

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 11
  1. What energy change occurs in a speaker?Electrical energy becomes sound
  2. How do you see an object?Reflected light enters your eyes
  3. What does a switch control?Whether a circuit is open or closed
  4. What do like magnetic poles do?Repel
  5. What happens to pitch as frequency rises?Pitch becomes higher
  6. Why does a shadow form?An object blocks light
  7. What can happen when light enters water?It refracts, or bends
  8. Why can you hear an echo?Sound reflects from a surface

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.