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Electricity, Magnetism, Light & Sound

Grade 5 · Stretch challenge · 8 questions · Version PG-144ZVD4-O17E

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

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 13
  1. What is the electromagnetic spectrum?The full range of electromagnetic waves
  2. What energy change occurs in a speaker?Electrical energy becomes sound
  3. What does a switch control?Whether a circuit is open or closed
  4. What affects electromagnet strength?Current, coil turns, and core material
  5. What happens to pitch as frequency rises?Pitch becomes higher
  6. Why does sound travel faster in solids?Close particles transfer vibrations quickly
  7. Why can you hear an echo?Sound reflects from a surface
  8. What can happen when light enters water?It refracts, or bends

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.