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Electricity, Magnetism, Light & Sound

Grade 4 · Stretch challenge · 8 questions · Version PG-OXS546-T6HC

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1.What energy change occurs in a speaker?
2.What affects electromagnet strength?
3.What happens to pitch as frequency rises?
4.What does a switch control?
5.Why are parallel circuit branches useful?
6.What can happen when light enters water?
7.Why does sound travel faster in solids?
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 7
  1. What energy change occurs in a speaker?Electrical energy becomes sound
  2. What affects electromagnet strength?Current, coil turns, and core material
  3. What happens to pitch as frequency rises?Pitch becomes higher
  4. What does a switch control?Whether a circuit is open or closed
  5. Why are parallel circuit branches useful?Each branch can operate independently
  6. What can happen when light enters water?It refracts, or bends
  7. Why does sound travel faster in solids?Close particles transfer vibrations quickly
  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.