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Electricity, Magnetism, Light & Sound

Grade 5 · Stretch challenge · 8 questions · Version PG-11NI85V-O17E

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1.Why does sound travel faster in solids?
2.Why are parallel circuit branches useful?
3.What is the electromagnetic spectrum?
4.What can happen when light enters water?
5.What happens to pitch as frequency rises?
6.Why can you hear an echo?
7.What does a switch control?
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 9
  1. Why does sound travel faster in solids?Close particles transfer vibrations quickly
  2. Why are parallel circuit branches useful?Each branch can operate independently
  3. What is the electromagnetic spectrum?The full range of electromagnetic waves
  4. What can happen when light enters water?It refracts, or bends
  5. What happens to pitch as frequency rises?Pitch becomes higher
  6. Why can you hear an echo?Sound reflects from a surface
  7. What does a switch control?Whether a circuit is open or closed
  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.