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Electricity, Magnetism, Light & Sound

Grade 4 · Stretch challenge · 8 questions · Version PG-ODSXQ8-T6HC

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1.What does a switch control?
2.What affects electromagnet strength?
3.Why does a shadow form?
4.Why can you hear an echo?
5.Why are parallel circuit branches useful?
6.What happens to pitch as frequency rises?
7.What energy change occurs in a speaker?
8.Why does sound travel faster in solids?

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 5
  1. What does a switch control?Whether a circuit is open or closed
  2. What affects electromagnet strength?Current, coil turns, and core material
  3. Why does a shadow form?An object blocks light
  4. Why can you hear an echo?Sound reflects from a surface
  5. Why are parallel circuit branches useful?Each branch can operate independently
  6. What happens to pitch as frequency rises?Pitch becomes higher
  7. What energy change occurs in a speaker?Electrical energy becomes sound
  8. Why does sound travel faster in solids?Close particles transfer vibrations quickly

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.