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Electricity, Magnetism, Light & Sound

Grade 4 · Stretch challenge · 8 questions · Version PG-PHRCI4-T6HC

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1.What happens to pitch as frequency rises?
2.Why can you hear an echo?
3.What does a switch control?
4.What can happen when light enters water?
5.Why does a shadow form?
6.Why are parallel circuit branches useful?
7.What is the electromagnetic spectrum?
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 happens to pitch as frequency rises?Pitch becomes higher
  2. Why can you hear an echo?Sound reflects from a surface
  3. What does a switch control?Whether a circuit is open or closed
  4. What can happen when light enters water?It refracts, or bends
  5. Why does a shadow form?An object blocks light
  6. Why are parallel circuit branches useful?Each branch can operate independently
  7. What is the electromagnetic spectrum?The full range of electromagnetic waves
  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.