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Electricity, Magnetism, Light & Sound

Grade 4 · On-level practice · 8 questions · Version PG-1NWWUKO-IE4M

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1.What is the electromagnetic spectrum?
2.What affects electromagnet strength?
3.What can happen when light enters water?
4.What happens to pitch as frequency rises?
5.Why does a shadow form?
6.What energy change occurs in a speaker?
7.Why can you hear an echo?
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 9
  1. What is the electromagnetic spectrum?The full range of electromagnetic waves
  2. What affects electromagnet strength?Current, coil turns, and core material
  3. What can happen when light enters water?It refracts, or bends
  4. What happens to pitch as frequency rises?Pitch becomes higher
  5. Why does a shadow form?An object blocks light
  6. What energy change occurs in a speaker?Electrical energy becomes sound
  7. Why can you hear an echo?Sound reflects from a surface
  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.