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Electricity, Magnetism, Light & Sound

Grade 4 · Stretch challenge · 8 questions · Version PG-RPO61W-T6HC

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

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 9
  1. What energy change occurs in a speaker?Electrical energy becomes sound
  2. Why are parallel circuit branches useful?Each branch can operate independently
  3. Why does sound travel faster in solids?Close particles transfer vibrations quickly
  4. What is the electromagnetic spectrum?The full range of electromagnetic waves
  5. What happens to pitch as frequency rises?Pitch becomes higher
  6. What affects electromagnet strength?Current, coil turns, and core material
  7. What does a switch control?Whether a circuit is open or closed
  8. Why does a shadow form?An object blocks light

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.