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Electricity, Magnetism, Light & Sound

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

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

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

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.