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Electricity, Magnetism, Light & Sound

Grade 4 · On-level practice · 8 questions · Version PG-1LP010W-IE4M

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

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

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.