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Electricity, Magnetism, Light & Sound

Grade 3 · On-level practice · 8 questions · Version PG-19B9QFS-JMEH

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

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

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.