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Electricity, Magnetism, Light & Sound

Grade 4 · Stretch challenge · 8 questions · Version PG-P7RQT5-T6HC

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1.What happens to pitch as frequency rises?
2.Why can you hear an echo?
3.What energy change occurs in a speaker?
4.What is the electromagnetic spectrum?
5.Why does sound travel faster in solids?
6.What affects electromagnet strength?
7.Why does a shadow form?
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 6
  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 energy change occurs in a speaker?Electrical energy becomes sound
  4. What is the electromagnetic spectrum?The full range of electromagnetic waves
  5. Why does sound travel faster in solids?Close particles transfer vibrations quickly
  6. What affects electromagnet strength?Current, coil turns, and core material
  7. Why does a shadow form?An object blocks light
  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.