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Electricity, Magnetism, Light & Sound

Grade 4 · Stretch challenge · 8 questions · Version PG-1PQ9IHT-T6HC

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

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 17
  1. Why does sound travel faster in solids?Close particles transfer vibrations quickly
  2. What affects electromagnet strength?Current, coil turns, and core material
  3. Why are parallel circuit branches useful?Each branch can operate independently
  4. Why can you hear an echo?Sound reflects from a surface
  5. Why does a shadow form?An object blocks light
  6. What can happen when light enters water?It refracts, or bends
  7. What does a switch control?Whether a circuit is open or closed
  8. What happens to pitch as frequency rises?Pitch becomes higher

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.