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Electricity, Magnetism, Light & Sound

Grade 4 · On-level practice · 8 questions · Version PG-NRH43K-IE4M

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1.What energy change occurs in a speaker?
2.Why does a shadow form?
3.What can happen when light enters water?
4.Why does sound travel faster in solids?
5.Why are parallel circuit branches useful?
6.What does a switch control?
7.Why can you hear an echo?
8.What is the electromagnetic spectrum?

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 10
  1. What energy change occurs in a speaker?Electrical energy becomes sound
  2. Why does a shadow form?An object blocks light
  3. What can happen when light enters water?It refracts, or bends
  4. Why does sound travel faster in solids?Close particles transfer vibrations quickly
  5. Why are parallel circuit branches useful?Each branch can operate independently
  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. What is the electromagnetic spectrum?The full range of electromagnetic waves

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.