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Electricity, Magnetism, Light & Sound

Grade 5 · Stretch challenge · 8 questions · Version PG-158YA50-O17E

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1.What can happen when light enters water?
2.What affects electromagnet strength?
3.What does a switch control?
4.What is the electromagnetic spectrum?
5.What energy change occurs in a speaker?
6.Why can you hear an echo?
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 17
  1. What can happen when light enters water?It refracts, or bends
  2. What affects electromagnet strength?Current, coil turns, and core material
  3. What does a switch control?Whether a circuit is open or closed
  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 can you hear an echo?Sound reflects from a surface
  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.