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Electricity, Magnetism, Light & Sound

Grade 4 · Stretch challenge · 8 questions · Version PG-MM57SF-T6HC

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1.Why does a shadow form?
2.Why are parallel circuit branches useful?
3.What can happen when light enters water?
4.Why can you hear an echo?
5.What energy change occurs in a speaker?
6.What is the electromagnetic spectrum?
7.What does a switch control?
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 20
  1. Why does a shadow form?An object blocks light
  2. Why are parallel circuit branches useful?Each branch can operate independently
  3. What can happen when light enters water?It refracts, or bends
  4. Why can you hear an echo?Sound reflects from a surface
  5. What energy change occurs in a speaker?Electrical energy becomes sound
  6. What is the electromagnetic spectrum?The full range of electromagnetic waves
  7. What does a switch control?Whether a circuit is open or closed
  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.