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Electricity, Magnetism, Light & Sound

Grade 4 · On-level practice · 8 questions · Version PG-1O6WG9N-IE4M

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

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

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.