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Electricity, Magnetism, Light & Sound

Grade 4 · On-level practice · 8 questions · Version PG-OBGBHI-IE4M

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

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 12
  1. What can happen when light enters water?It refracts, or bends
  2. What is the electromagnetic spectrum?The full range of electromagnetic waves
  3. Why does sound travel faster in solids?Close particles transfer vibrations quickly
  4. What does a switch control?Whether a circuit is open or closed
  5. What energy change occurs in a speaker?Electrical energy becomes sound
  6. What affects electromagnet strength?Current, coil turns, and core material
  7. What happens to pitch as frequency rises?Pitch becomes higher
  8. Why are parallel circuit branches useful?Each branch can operate independently

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.