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Electricity, Magnetism, Light & Sound

Grade 4 · Stretch challenge · 8 questions · Version PG-1P6AB3V-T6HC

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1.Why can you hear an echo?
2.What energy change occurs in a speaker?
3.What affects electromagnet strength?
4.What happens to pitch as frequency rises?
5.What can happen when light enters water?
6.Why does a shadow form?
7.Why does sound travel faster in solids?
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 15
  1. Why can you hear an echo?Sound reflects from a surface
  2. What energy change occurs in a speaker?Electrical energy becomes sound
  3. What affects electromagnet strength?Current, coil turns, and core material
  4. What happens to pitch as frequency rises?Pitch becomes higher
  5. What can happen when light enters water?It refracts, or bends
  6. Why does a shadow form?An object blocks light
  7. Why does sound travel faster in solids?Close particles transfer vibrations quickly
  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.