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Electricity, Magnetism, Light & Sound

Grade 3 · On-level practice · 8 questions · Version PG-DP1N4W-JMEH

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

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 13
  1. Why does a shadow form?An object blocks light
  2. What energy change occurs in a speaker?Electrical energy becomes sound
  3. What happens to pitch as frequency rises?Pitch becomes higher
  4. What can happen when light enters water?It refracts, or bends
  5. How do you see an object?Reflected light enters your eyes
  6. What do opposite magnetic poles do?Attract
  7. Why can you hear an echo?Sound reflects from a surface
  8. What does a switch control?Whether a circuit is open or closed

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.