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Electricity, Magnetism, Light & Sound

Grade 5 · Stretch challenge · 8 questions · Version PG-15SXHIY-O17E

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1.What energy change occurs in a speaker?
2.What can happen when light enters water?
3.Why are parallel circuit branches useful?
4.Why can you hear an echo?
5.Why does a shadow form?
6.Why does sound travel faster in solids?
7.What happens to pitch as frequency rises?
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 15
  1. What energy change occurs in a speaker?Electrical energy becomes sound
  2. What can happen when light enters water?It refracts, or bends
  3. Why are parallel circuit branches useful?Each branch can operate independently
  4. Why can you hear an echo?Sound reflects from a surface
  5. Why does a shadow form?An object blocks light
  6. Why does sound travel faster in solids?Close particles transfer vibrations quickly
  7. What happens to pitch as frequency rises?Pitch becomes higher
  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.