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Electricity, Magnetism, Light & Sound

Grade 4 · Stretch challenge · 8 questions · Version PG-Q1QJW2-T6HC

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1.Why can you hear an echo?
2.What is the electromagnetic spectrum?
3.What can happen when light enters water?
4.What does a switch control?
5.Why does sound travel faster in solids?
6.What energy change occurs in a speaker?
7.Why does a shadow form?
8.What happens to pitch as frequency rises?

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 3
  1. Why can you hear an echo?Sound reflects from a surface
  2. What is the electromagnetic spectrum?The full range of electromagnetic waves
  3. What can happen when light enters water?It refracts, or bends
  4. What does a switch control?Whether a circuit is open or closed
  5. Why does sound travel faster in solids?Close particles transfer vibrations quickly
  6. What energy change occurs in a speaker?Electrical energy becomes sound
  7. Why does a shadow form?An object blocks light
  8. What happens to pitch as frequency rises?Pitch becomes higher

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.