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Electricity, Magnetism, Light & Sound

Grade 5 · Stretch challenge · 8 questions · Version PG-16MZG3U-O17E

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1.What does a switch control?
2.Why can you hear an echo?
3.What can happen when light enters water?
4.What is the electromagnetic spectrum?
5.What energy change occurs in a speaker?
6.Why does sound travel faster in solids?
7.Why does a shadow form?
8.What affects electromagnet strength?

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 20
  1. What does a switch control?Whether a circuit is open or closed
  2. Why can you hear an echo?Sound reflects from a surface
  3. What can happen when light enters water?It refracts, or bends
  4. What is the electromagnetic spectrum?The full range of electromagnetic waves
  5. What energy change occurs in a speaker?Electrical energy becomes sound
  6. Why does sound travel faster in solids?Close particles transfer vibrations quickly
  7. Why does a shadow form?An object blocks light
  8. What affects electromagnet strength?Current, coil turns, and core material

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.